Project Blue Book: The Air Force's Cold War UFO Investigation and the Persistence of Unexplained Cases
To the point
Project Blue Book was the Air Force’s Cold War effort to study UFO sightings; although most cases were explained, some remained inexplicable, with J. Allen Hynek urging acknowledgment and Lonnie Zamora’s Socorro encounter emblematic, and the 1969 Condon Report shutting the program left questions about witnesses and how the government framed uncertainty.