Project Blue Book was a United States Air Force initiative that systematically studied unidentified flying objects (UFOs) from 1952 to 1969. The project, which succeeded earlier investigations like Project Sign and Project Grudge, aimed to determine if UFOs posed a threat to national security and to analyze related data. While the Air Force concluded that most UFO reports were misidentified natural phenomena or conventional aircraft, a significant number remained unexplained. The Condon Report, commissioned in 1966, ultimately led to the termination of Project Blue Book, as its findings suggested that further UFO research was unlikely to produce significant scientific discoveries.