Project Blue Book (1952–1969): A Systematic Air Force UFO Study, Key Debates, and Its 1969 Closure

To the point

Project Blue Book was the Air Force’s systematic 1952–1969 study of UFOs that gathered about 12,600 reports, was led by Edward J. Ruppelt and later Hector Quintanilla, involved J. Allen Hynek, faced the Robertson Panel’s push to debunk and tighten controls, and ended in 1969 with a conclusion that sightings were misidentifications, hoaxes, or psychological effects rather than threats or evidence of extraterrestrial technology, leaving public mistrust and fueling conspiracy theories.