In 1947, a rash of sightings of unexplained flying objects (UFOs) swept America. Although the newly formed U.S. Air Force was the primary investigator of these sightings, the FBI received many reports and worked for a time with the Air Force to investigate these matters between 1947 and 1954. The CIA investigated UFOs into the early 1990s. This book includes documents from the CIA, the U.S. Air Force, and NSA,. It also provides a Unidentified Flying Objects Research Guide.