Documents

Air Force Press Release 629-49. Preliminary Studies on Flying Saucers, April 27, 1949."The mere existence of some yet unidentified flying objects necessitates a constant vigilance...on the part of the civilian population. Answers have been - and will be - drawn from such factors as guided missile research activity, balloons, astronomical phenomena...but there are still question marks...The saucers are not jokes. Neither are they cause for alarm."

Air Force Press Release, c December 30, 1949. The Air Force denies the existence of flying saucers. "It will never be possible to say with certainty that any individual did not see a space ship, an enemy missile, or some other object."

Donald Keyhoe. "The Flying Saucers are Real." True Magazine. January 1950.

Donald Keyhoe. "The Flying Saucers Are Real." Gold Medal Books (Fawcett), New York, 1950.

Air Force Press Release, c February 22, 1950. Air Force reiterates there is no such thing as flying saucers.

"Air Technical Intelligence Briefing." Air Technical Intelligence Center. Wright-Patterson Air Force Base, Ohio. c1957.

"Aids to Identification of Flying Objects."
 Apparently emerged from European based Air Force and submitted by a C.C. Rogers "Buck", a Colonel, USAF, DCS/Intelligence. c 1957 (based on letter dated 25 April 1957).

"Preliminary Study of Flying Saucers."

"Unidentified Flying Objects.' For use with Ground Observer Corp Personnel.