"Unidentified Flying Objects (UFO)-Relates to any airborne object which by performance, aerodynamic characteristics, or unusual features does not conform to any presently known aircraft or missle type, or which cannot be identified as a familiar object"
Extract from document "Air Force Regulation No. 200-2".
"DEPARTMENT OF THE AIR FORCE,WASHINGTON, 12 AUGUST 1954."
OTHER UFO WEBSITES:
Stanton T. Friedman's home page