Donald Kehoe investigated many of the earliest encounters between the U.S. Air Force and UFOs. Keyhoe believed the Air Force was actively investigating these close encounters, and also came to the conclusion that the Earth has been visited by Beings from outer space for at least two and a half centuries. He also noted, that the sightings increased sharply with the coming of the Atomic Age after WWII. Using anecdotal evidence, Kehoe intimates that the government may have attained and adapted alien technology. Written in an engaging, narrative style, this book is a must have for any UFO library.