65_HS1-834228961_62-HQ-83894_Serial_164.pdf

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DEPARTMENT OF THE AIR FORCE 
HEADQUARTERS UN1TED 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 Colle…

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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, Ohio, Attn: MCIAXO-3 by installations receiv­
ing informati…

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b. Air 
(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.' 
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 o…

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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. Vi…

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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). 
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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. Reliability. 
10. Comments of interrogator regarding the intell1gence and character of person interrogated. 
Relative to Radar Sightings 
1. Re radars operating on ground. 
a. Observations of range, speed, al…

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3. Local flight schedules of commercial, private and military aircraft flying in vic!nity 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. 
Jf 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. 
Jf object came sufficiently near other aircraft or known objects check surfaces w…