Category:United States government responses to UFOs

Articles relating to the investigation of UFO reports by the United States government, which has taken place under multiple branches and agencies, past and current, since 1947. The first programs were established under the U.S. Air Force between 1947 and 1969 with Project Sign, Project Grudge, and finally Project Blue Book. The Condon Report in 1968 led the U.S. to stop spending resources on the effort to receive and analyze UFO reports because "nothing has come from the study of UFOs in the past 21 years that has added to scientific knowledge" and "further extensive study of UFOs probably cannot be justified".