Persistent and determined investigation of world-wide aerial phenomena got this author into trouble with the Air Force but the closed project was opened in 1952 and sighting reports and patterns, pilot observations, films, etc. were gradually made available to him. This is his recap of the weird machines, known as Unidentified Flying Objects in Project Bluebook, as the military hedged, hemmed and hawed to avoid public panic and hysteria, as it used every control to screen the UFOs and as case after case was analyzed. The temperature inversion and other theories, the Sutton Monster in West Virginia, all kept the question open, waiting for proof of interplanetary space travel and observation from outer space and for clues as to the origin and purpose of such airborne objects... Currently accepting the interplanetary nature of the UFOs, the author lays it on for civilian realization of the possibilities, for measures to be taken against sudden landings, attacks or invasions. Considering the Air Force Intelligence data -- this is a needle for a quick think and long ponder. Newsworthy.