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This FBI file serial 164 in 62-HQ-83894 holds several copies of Air Intelligence Requirements Memorandum Number 4, "Unconventional Aircraft," issued 15 February 1949 by the Directorate of Intelligence, Headquarters United States Air Force. Major General C. P. Cabell signed it. It sets out continuing Air Force requirements for information on unconventional aircraft and unidentified flying objects, including "Flying Discs," and tells commands and outside agencies to send reports to the Air Materiel Command at Wright-Patterson AFB. It also lists detailed reporting questions on sightings, observers, radar data and physical evidence.
“Office of Special Investigations”13 pages
RESTRICTED S. Local flight schedules of commercial, private and military aircraft :flying in vic!nlty at the time. (Check Canadian activity 1f close to that border.) 4. Possible releases of testing devlces in vicinity sent aloft by Ordnance, Navy, Air Force, Ar my, Weather Units, Research Organlzatlons or any other. 5. If 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 lmown objects check surfaces with Gelger counters for possible rad1oact1v1ty. 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 (lf this happened). d. Maneuvers. e . Formation lf 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, Le., (any projections or extentlons that might presum ably be constr ued as such). c:P.~C. P. CABELL Major General, USAF Director of Intelllgence, Office of Deputy Chief of Staff, Operations DISTRIBUTION: Commanding Generals, Major Alr Commands, ZI and Overseas All United States Alr Attaches Director of Central Intelligence Special Assistant for Resear ch and Intelligence, Depart ment of State Director of Intelligence, GSUSA Chief of Naval Intelllgence Commandant (I.NT), United States Coast Guard Director , Federal Bureau of Investigation RESTRICTED - 7 -
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