65_HS1-834228961_62-HQ-83894_Serial_164
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65_HS1-834228961_62-HQ-83894_Serial_164
The FBI's 62-HQ-83894 case file includes investigative records, eyewitness testimonies, and public reports concerning Unidentified Flying Objects and flying discs documented between June 1947 and July 1968. The records include high-profile incident accounts, photographic evidence from sites like Oak Ridge, TN, and technical proposals regarding potential propulsion systems. Additional topics include convention programs, researcher accounts, and extensive media coverage from the period. This file is partially posted on FBI vault with more redactions and some pages missing. Included here is the complete case file with several newly declassified pages and only minor redactions.
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--- page 2 ---
S T . RESTRICTED .
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF' INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION s
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 26 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, “Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
: ] RESTRICTED C9-8892,4F
--- page 3 ---
@ ResTRICTED » Sty 58
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
y (2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
A it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com- E
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(38) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
o RESTRICTED
--- page 4 ---
G ® RESTRICTED )
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
¥ c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11, Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
RESTRICTED - 8-
--- page 5 ---
@ resTRicTED (] S
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet. ;
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 6 ---
s> $ restricten @
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19, Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED -5 -
--- page 7 ---
. RSt Ao
@ restricTED $ L
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees. 3
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
-8 - RESTRICTED
--- page 8 ---
3 o Ll NCera o e
- R A
7 (] restricten @
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices In vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
2 Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7-
--- page 9 ---
& RESTRICTED ® S
L 4
RESTRICTED
--- page 10 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
156 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED £9-4892, AF
--- page 11 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c¢. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand,
PART I - REQUIREMENTS
General
1. Date of sighting. b
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(8) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 8 RESTRICTED
--- page 12 ---
RESTRICTED
b. Alr
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
(1) Latitude and longitude.
' (2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size,
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11, Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
RESTRICTED -3 -
--- page 13 ---
RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12, Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud. ‘
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a, Fins
b. Stabilizers (horizontal or vertical).
(1) sSize.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 14 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color,
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED ol
--- page 15 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. £
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation,
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
: Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.,
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1, Teletype sequences of local weather conditions.
2. Winds aloft report.
-8 - RESTRICTED
--- page 16 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. I object contacted earth, obtaln soll samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a., Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7-
--- page 17 ---
RESTRICTED
RESTRICTED
--- page 18 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘“‘Flying Dises.”’
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 26 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United Statecs Air Force. Cables will contain the phase, ‘“‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED C9-4892, AF
--- page 19 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
¢. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Coples of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand,
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
-2 RESTRICTED
--- page 20 ---
RESTRICTED
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11, Evidence of exhaust.
a, Color of smoke.
vb. Length and width.
RESTRICTED -8
--- page 21 ---
RESTRICTED
¢. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13, Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a., Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic 1ift (balloon or dirigible).
156. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(8) Location.
-4 - RESTRICTED
--- page 22 ---
RESTRICTED
17, Air ducts.
a. Slots.
b. Duct openings.
18, Speed - M.P.H.
19, Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh,
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c¢. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etec.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color,
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED iy
--- page 23 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a., Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne,
9. Witnesses.
a, Addressees.
b. Occupation,
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
AN B RESTRICTED
--- page 24 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radlioactivity, Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a, Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtaln fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
Z1 and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED ol s
--- page 25 ---
RESTRICTED
RESTRICTED
--- page 26 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
156 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Disecs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED 94892, AF
£ /
--- page 27 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting. .
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
-2 RESTRICTED
--- page 28 ---
RESTRICTED
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude,
c. Sea
(1) Latitude and longitude.
‘ (2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
vb., Length and width.
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--- page 29 ---
RESTRICTED
¢. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud. |
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor,
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(8) Location.
-4 - RESTRICTED
--- page 30 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18, Speed - M.P.H,
19, Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED Fhi=
--- page 31 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. .
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation,
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
‘ Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
¢. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a, Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
SUBee RESTRICTED
--- page 32 ---
RESTRICTED
3. Local flight schedules of commercial, private and military alrcraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4, Possible releases of testing devices In vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radicactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two,
8, Secure signed statement.
9, Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
Z1 and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7 -
--- page 33 ---
RESTRICTED
RESTRICTED
--- page 34 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”’
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 256 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED £9-4892,AF
--- page 35 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Alr Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
¢. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Alr Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Alr
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a, Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 8= RESTRICTED
--- page 36 ---
RESTRICTED
(1) Type alrcraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11, Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
RESTRICTED -3 -
--- page 37 ---
RESTRICTED
c. Odor (if any).
d. Rate of evaporation,
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13, Lights.
a, Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16, Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 38 ---
RESTRICTED
17, Air ducts.
a, Slots.
b. Duct openings.
18. Speed - M.P.H.
19, Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance,
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view,
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED e
--- page 39 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
alrborne.
9. Witnesses.
a, Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person Interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a, Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
¢. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. I airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1, Teletype sequences of local weather conditions.
2. Winds aloft report.
=8 s RESTRICTED
--- page 40 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6, If object came sufficiently near other aircraft or known objects check surfaces with Gelger
counters for possible radloactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED Sa %
--- page 41 ---
RESTRICTED
RESTRICTED
--- page 42 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘“‘Flying Discs.”
b. To establish procedures for reporting such information,
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED £9-4892, AF
--- page 43 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned,
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting. o
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
Qs RESTRICTED
--- page 44 ---
RESTRICTED
b. Alr
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
(1) Latitude and longitude.
Y (2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
RESTRICTED -3 -
--- page 45 ---
RESTRICTED
¢. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud. ‘
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support E
a. Wings.
b. Aerodynamic list of fuselage.
¢. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 46 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1, Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED
--- page 47 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. J
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
¢. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated. |
: Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible,
2, If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
-8 - RESTRICTED
--- page 48 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
6. I object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Gelger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers,
e, Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED S
--- page 49 ---
RESTRICTED
RESTRICTED
--- page 50 ---
RESTRICTED :
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 26 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United Statcs Air Force. Cables will contain the phase, ”l'fass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.’
RESTRICTED £9-4892, AF
--- page 51 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Alr Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
¢. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these Instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Alr Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART I - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a, Ground
(1) City, town. 4
(2) Distance and direction from city or town, road, intersection, etec.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
=2 a RESTRICTED
--- page 52 ---
RESTRICTED
(1) Type alrcraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight,
10, Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
vb. Length and width,
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--- page 53 ---
RESTRICTED
¢. Odor (if any).
d. Rate of evaporation,
e. Does trail vary with sound? (spurts)
12, Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d., Showed thru cloud.
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14. Support
a. Wings,
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 54 ---
RESTRICTED
17, Air ducts.
a, Slots,
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
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--- page 55 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FRBI records.
(4) Employer.
8. Notes relative to observer on:
a, Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
¢. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a, Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person Interrogated.
Relative to Radar Sightings
1. Re radars operating on ground,
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible,
2. H airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAI
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
-8 RESTRICTED
--- page 56 ---
RESTRICTED
3. Local flight schedules of commercial, private and military alrcraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7-
--- page 57 ---
RESTRICTED
RESTRICTED
--- page 58 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘“‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED £9-4892, AF
b ¢ / o
--- page 59 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Alr Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Coples of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these Instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112,
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1, Date of sighting. .
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
D RESTRICTED
--- page 60 ---
RESTRICTED
b, Air
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark,
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a., Color of smoke.
vb. Length and width.
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--- page 61 ---
RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12, Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud. ‘
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a, Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 62 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18, Speed - M.P.H.
19, Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED o
--- page 63 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. 5
8. Notes relative to observer on:
a, Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
¢. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated. 4
‘ Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
5 B RESTRICTED
--- page 64 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying In vicinity at the
time. (Check Canadian activity if close to that border.)
4, Possible releases of testing devices In vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. H object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Gelger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8, Secure signed statement.
9, Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
Z1 and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7 -
--- page 65 ---
RESTRICTED
RESTRICTED
--- page 66 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘“Flying Dises.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, “Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED €9-4892, AF
--- page 67 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Alr Force.
(8) Commanding General, Alr Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
¢. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II,
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112,
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Alr Force are requested to forward
reports direct to the Commanding General, Alr Materiel Command, Wright-Patterson Alr
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, ete.
(8) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
-2~ RESTRICTED
--- page 68 ---
RESTRICTED
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
¢. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
¢. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as It appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a, Color of smoke.
vb. Length and width,
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--- page 69 ---
RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12, Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
138, Lights.
a. Reflected or attached.
b, Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
16. Propulsion.
a. Propeller or jet.
b. Rotor.
¢, Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16, Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(8) Location.
-4 - RESTRICTED
--- page 70 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh,
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
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--- page 71 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FRBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(8) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
alrborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a., Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
-8 - RESTRICTED
--- page 72 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity, Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
¢. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7-
--- page 73 ---
RESTRICTED
RESTRICTED
--- page 74 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying cbjects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 256 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED £9-4892, AF
--- page 75 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112,
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand,
PART II - REQUIREMENTS
General
1. Date of sighting. .
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(8) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
= 2.9 RESTRICTED
--- page 76 ---
RESTRICTED
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers,
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust,
a. Color of smoke.
vb. Length and width.
RESTRICTED -8
--- page 77 ---
RESTRICTED
¢. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud. ‘
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 78 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19, Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED -5-
--- page 79 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. ¢
8. Notes relative to observer on:
a, Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion,
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c¢. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated. E
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
= B RESTRICTED
--- page 80 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. I object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radloactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a, Object.
b. Surrounding terrain where observed.
¢, Place where it contacted earth (if this happened).
d. Maneuvers.
e, Formation if objects were more than two.
8, Secure signed statement,
9, Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7
--- page 81 ---
RESTRICTED
RESTRICTED
--- page 82 ---
RESTRICTED {
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertalning to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 26 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘“‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED £9-4892, AF
--- page 83 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Alr Materiel Command is authorized direct contact with major
Alr Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
¢. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
@) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Alr Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a, Ground
(1) City, town.
(2) Distance and direction from ecity or town, road, intersection, etc.
(8) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
-2 - RESTRICTED
--- page 84 ---
RESTRICTED
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(3) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a, Laterally or horizontally.
b. Angle of elevation from horizon,
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10, Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, ete.
11, Evidence of exhaust.
a, Color of smoke.
vb. Length and width.
RESTRICTED -8 -
--- page 85 ---
RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13, Lights.
a, Reflected or attached.
b, Luminous
¢, Blinked on and off in relation to speed.
14, Support
a, Wings.
b. Aerodynamic list of fuselage.
c¢. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15, Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(8) Location.
-4 - RESTRICTED
--- page 86 ---
RESTRICTED
17, Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh,
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Abllity to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED £45
--- page 87 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
alrborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
-8- RESTRICTED
--- page 88 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4, Possible releases of testing devices In vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
6. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement,
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -17-
--- page 89 ---
RESTRICTED
RESTRICTED
--- page 90 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 256, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘““Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."”
RESTRICTED 9-4892, AF
--- page 91 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these Instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112,
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART I - REQUIREMENTS
General
1. Date of sighting. "
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
I RESTRICTED
--- page 92 ---
RESTRICTED
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
8. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
RESTRICTED aFgs
--- page 93 ---
RESTRICTED
¢. Odor (if any).
1. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a, Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud. 1
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
16. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 94 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a, Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
- 1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED B
--- page 95 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. .
8. Notes relative to observer on:
a, Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a., Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated. 4
: Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 8.~ RESTRICTED
--- page 96 ---
RESTRICTED
3. Local flight schedules of commercial, private and military alircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Gelger
counters for possible radiocactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
¢. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9, Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
Z1 and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7 -
--- page 97 ---
RESTRICTED
RESTRICTED
--- page 98 ---
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DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertalning to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings,
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."”
RESTRICTED £9-4892, AF
--- page 99 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Alr Commands (overseas) and organizations under their control in comnection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(3) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112,
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Alr Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3,
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town,
(2) Distance and direction from city or town, road, intersection, etc.
(8) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
-2 RESTRICTED
--- page 100 ---
RESTRICTED
(1) Type alrcraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon,
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10, Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc,
11, Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
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--- page 101 ---
RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12, Effect on clouds,
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d, Showed thru cloud.
13, Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability,
a. Fins
b. Stabilizers (horizontal or vertical).
(1) sSize.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 102 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED Ly 2
--- page 103 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
¢. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person Interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a, Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar Inductlons or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
-8 - RESTRICTED
--- page 104 ---
RESTRICTED
3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadlian activity if close to that border.)
4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a, Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7-
--- page 105 ---
RESTRICTED
RESTRICTED
--- page 106 ---
RESTRICTED
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 25 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ““Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3."”
RESTRICTED €9-4892, AF
--- page 107 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Coples of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these Instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it Is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting. y
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
- 2= RESTRICTED
--- page 108 ---
RESTRICTED
b. Alr
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a, Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
RESTRICTED g
--- page 109 ---
RESTRICTED
c¢. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud. l
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) size.
(2) Shape.
(3) Location.
-4 - RESTRICTED
--- page 110 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance,
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence,
b. Faded from view,
c. Disappeared behind obstacle.
Relative to the Observer
- 1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
RESTRICTED -5 -
--- page 111 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. 2
8. Notes relative to observer on:
a., Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
¢. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated. E
. Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. I airborne when object sighted.
a, Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
- 8- RESTRICTED
--- page 112 ---
RESTRICTED
3. Local flight schedules of commercial, private and military alrcraft flylng in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Alr Force,
Army, Weather Units, Research Organizations or any other.
5. I object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement,
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Special Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
RESTRICTED -7 -
--- page 113 ---
RESTRICTED
RESTRICTED
--- page 114 ---
RESTRICTED i
DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Alr Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 256 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, “}',’ass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.
RESTRICTED €9-14892, AF
--- page 115 ---
RESTRICTED
(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
¢. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112,
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Alr Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a, Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
-2 RESTRICTED
--- page 116 ---
RESTRICTED
b Alr
(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
RESTRICTED -8.
--- page 117 ---
RESTRICTED
c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d, Showed thru cloud.
13, Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16, Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(8) Location.
-4 - RESTRICTED
--- page 118 ---
RESTRICTED
17. Air ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19, Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b, Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation,
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color,
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer,
a. Sources.
RESTRICTED 2L
--- page 119 ---
RESTRICTED
(1) Neighbors.
(2) Police Dept.
(38) FBI records.
(4) Employer.
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person Interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a, Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etec. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
L W RESTRICTED
--- page 120 ---
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3. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. I object contacted earth, obtain soll samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radloactivity, Make comparisons with other unaffected aircraft objects, ete,
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
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DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART 1 - GENERAI
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Disecs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 4256.1, dated 256 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Alr Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United Statcs Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
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(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Air Force.
(3) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Air Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohlo, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it Is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting. "
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
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(1) Type aircraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4, Number of objects.
Formation type (if any), sketch if possible.
6. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a, Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d., Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, osclllating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a. Color of smoke.
vb. Length and width.
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c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
¢. Reflected on cloud.
d. Showed thru cloud. ‘
13. Lights.
a. Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a. Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion.
a. Propeller or jet.
b. Rotor.
¢. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a, Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
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17. Alr ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4. Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
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(1) Neighbors.
(2) Police Dept.
(3) FBI records.
(4) Employer. .
8. Notes relative to observer on:
a. Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(3) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Rellability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
. Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
c. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. If airborne when object sighted.
a. Were there any radar inductions or extra nolse on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
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3. Local flight schedules of commercial, private and military alrcraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4. Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. I object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity. Make comparisons with other unaffected aircraft objects, etc.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a. Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
Z1 and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
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DEPARTMENT OF THE AIR FORCE
HEADQUARTERS UNITED STATES AIR FORCE
DIRECTORATE OF INTELLIGENCE
WASHINGTON 25, D. C.
15 February 1949
AIR INTELLIGENCE REQUIREMENTS
MEMORANDUM NUMBER 4
UNCONVENTIONAL AIRCRAFT
PART I - GENERAL
1. PURPOSE
The purpose of this memorandum is twofold:
a. To enunciate continuing Air Force requirements for information pertaining to sightings of
unconventional aircraft and unidentified flying objects, including the so-called ‘‘Flying Discs.”
b. To establish procedures for reporting such information.
2. RESCISSION
Department of the Army Collection Memorandum Number 7, dated 21 January 1948, and letter,
CSGID 425.1, dated 256 March 1948, both subject as above, which have been transferred to Air
Force agencies for action, are herewith superseded.
3. REPORTING
a. General
(1) As complete an answer to the requirements enunciated in Part II, as may be procur-
able, should be dispatched by means of electrical transmission immediately after sightings.
(2) Supplementary reports should be forwarded as available by the most expeditious means
consistent with the importance of the information reported.
b. Major Air Commands (Overseas) and Air Attaches
(1) Initial and supplementary cabled reports will be transmitted to the Director of Intelli-
gence, Headquarters United States Air Force. Cables will contain the phase, ‘‘Pass to
COMGENAMC WRIGHT-PATTERSON AFB, DAYTON, OHIO, ATTN: MCIAXO-3.”
RESTRICTED £9-4892, AF
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(2) Supplementary written reports, prepared on AF Form 112, will be forwarded to the
Director of Intelligence, Headquarters United States Alr Force.
(8) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (overseas) and organizations under their control in connection with the
development of information on this subject.
c. Major Air Commands (ZI)
(1) Reports will be forwarded direct to the Commanding General, Alr Materiel Command,
Wright-Patterson Air Force Base, Dayton, Ohio, Attn: MCIAXO-3 by installations receiv-
ing information pertaining to the requirements enunciated in Part II.
(2) Copies of such reports may be supplied the Command Headquarters of the installation
concerned.
(8) A copy of all reports sent to Air Materiel Command in accordance with these instruc-
tions will be forwarded at the same time to the Director of Intelligence, Headquarters
United States Air Force.
(4) Written reports will be submitted on AF Form 112.
(5) Commanding General, Air Materiel Command is authorized direct contact with major
Air Commands (ZI) and organizations under their control in connection with the develop-
ment of information on this subject.
d. Non-Air Force Agencies
(1) Addressees other than those of the United States Air Force are requested to forward
reports direct to the Commanding General, Air Materiel Command, Wright-Patterson Air
Force Base, Dayton, Ohio, Attn: MCIAXO-3.
(2) In order to reduce the time factor involved in transmission of this type of information
it is requested that, wherever communications facilities permit, subordinate elements be
authorized to communicate reports direct to the Commanding General, Air Materiel Com-
mand.
PART II - REQUIREMENTS
General
1. Date of sighting.
2. Time of sighting (zonal by 24 hr. clock).
3. Where sighted (observer’s position):
a. Ground
(1) City, town.
(2) Distance and direction from city or town, road, intersection, etc.
(3) From building (story), yard, etc.
(4) Map coordinates (if feasible) showing latitude and longitude.
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(1) Type alrcraft, speed, altitude, direction of flight.
(2) Distance and direction from city, town or known landmark.
(8) Clock position of object from observer’s aircraft.
(4) Latitude and longitude.
c. Sea
(1) Latitude and longitude.
(2) Proximity to land. (Name city, country, etc.)
4. Number of objects.
Formation type (if any), sketch if possible.
5. Observable celestial phenomena or planets that may account for the sighting. (Local facilities
or organizations which follow such celestial phenomena should be consulted for such information.)
6. Distance of object from observer.
a. Laterally or horizontally.
b. Angle of elevation from horizon.
c. Altitude.
7. Time in sight.
8. Appearance of object.
a. Color.
b. Shape. (Sketch if possible)
c. Apparent construction. (Of what material or substance)
d. Size.
(1) Estimated size.
(2) Size as it appeared from observer’s view. (Compared to known object)
9. Direction of flight.
10. Tactics or maneuvers.
Vertical ascent or descent, horizontal, oscillating, fluttering, evasive, aggressive, erratic, etc.
11. Evidence of exhaust.
a, Color of smoke.
vb. Length and width,
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c. Odor (if any).
d. Rate of evaporation.
e. Does trail vary with sound? (spurts)
12. Effect on clouds.
a. Opened path thru clouds.
b. Forced cloud or mists.
c. Reflected on cloud.
d. Showed thru cloud.
13, Lights.
a, Reflected or attached.
b. Luminous
c. Blinked on and off in relation to speed.
14, Support
a, Wings.
b. Aerodynamic list of fuselage.
c. Vertical jet.
d. Rotating cylinder or cone.
e. Aerostatic lift (balloon or dirigible).
15. Propulsion,
a. Propeller or jet.
b. Rotor.
c. Aerodynamic vanes (flapping or oscillating) (Katz Mayer effect).
d. Visible exhaust or jet openings.
16. Control and stability.
a. Fins
b. Stabilizers (horizontal or vertical).
(1) Size.
(2) Shape.
(3) Location.
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17. Alr ducts.
a. Slots.
b. Duct openings.
18. Speed - M.P.H.
19. Sound.
a. Continuous whine or buzz.
b. Roar, whistle, whoosh.
c. Intermittent.
20. Manner of disappearance.
a. Explode.
(1) Possibility of fragments.
(2) Other physical evidence.
b. Faded from view.
c. Disappeared behind obstacle.
Relative to the Observer
1. Name of observer.
2. Address.
3. Occupation.
4, Place of business.
a. Employer or employee.
5. Pertinent hobbies.
a. Is observer amateur astronomer, pilot, engineer, etc.
b. Length of time engaged in hobby (experience).
6. Ability to determine:
a. Color.
b. Speed of moving objects.
c. Size at distance.
7. Reliability of observer.
a. Sources.
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(1) Neighbors.
(2) Police Dept.
(8) FBI records.
(4) Employer.
8. Notes relative to observer on:
a., Sightings in general.
b. How attention was drawn to object(s).
(1) Sound.
(2) Motion.
(8) Glint of light.
c. Degree of fatigue and duration of flight at time of sighting in cases where observer is
airborne.
9. Witnesses.
a. Addressees.
b. Occupation.
c. Reliability.
10. Comments of interrogator regarding the intelligence and character of person interrogated.
Relative to Radar Sightings
1. Re radars operating on ground.
a. Observations of range, speed, altitude and size of target.
b. Did target executive any turns? If so, what angle (180°), etc. and what radius of turn.
If radius of turn is not observable, how long did the target stay in the turn and what was its speed?
¢. Note particularly any separation of distant target into several targets upon approach. Track
all if possible.
2. I airborne when object sighted.
a. Were there any radar inductions or extra noise on radio circuits?
b. Give estimates of size, speed, maneuvers, etc.
GENERAL
1. Teletype sequences of local weather conditions.
2. Winds aloft report.
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8. Local flight schedules of commercial, private and military aircraft flying in vicinity at the
time. (Check Canadian activity if close to that border.)
4, Possible releases of testing devices in vicinity sent aloft by Ordnance, Navy, Air Force,
Army, Weather Units, Research Organizations or any other.
5. If object contacted earth, obtain soil samples within and without depression or spot where
object landed (and then presumably departed) for purpose of making comparison of soils.
6. If object came sufficiently near other aircraft or known objects check surfaces with Geiger
counters for possible radioactivity, Make comparisons with other unaffected aircraft objects, etec.
7. Obtain photographs (or original negatives) where available; if not, secure sketches of:
a, Object.
b. Surrounding terrain where observed.
c. Place where it contacted earth (if this happened).
d. Maneuvers.
e. Formation if objects were more than two.
8. Secure signed statement.
9. Obtain fragments or physical evidence where possible.
10. Was any radio antenna to be observed, i.e., (any projections or extentions that might presum-
ably be construed as such).
C. P. CABELL
Major General, USAF
Director of Intelligence, Office of
Deputy Chief of Staff, Operations
DISTRIBUTION:
Commanding Generals, Major Air Commands,
ZI and Overseas
All United States Air Attaches
Director of Central Intelligence
Speclal Assistant for Research and Intelligence,
Department of State
Director of Intelligence, GSUSA
Chief of Naval Intelligence
Commandant (INT), United States Coast Guard
Director, Federal Bureau of Investigation
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