Project Blue Book - 1940s Case Files - 505 cases

Project Blue Book was one of a series of systematic studies of unidentified flying objects (UFOs) conducted by the United States Air Force. It started in 1952, and it was the third study of its kind (the first two were projects Sign (1947) and Grudge (1949)). A termination order was given for the study in December 1969, and all activity under its auspices ceased in January 1970.  Project Blue Book had two goals:  * To determine if UFOs were a threat to national security, and * To scientifically analyze UFO-related data.