This was one of the first books published about the UFO phenomena. It is a template for much of what would follow: the paranoia, the government disinformation, the inescapable conclusion that the saucers are not of this earth. The case studies are real. The witnesses were highly reliable. These cases are still unexplained.
Keyhoe contended that the Air Force was actively investigating these cases of close encounter, with a policy of concealing their existence from the public.
Keyhoe further stated that Earth had been visited by extraterrestrials for two centuries, with the frequency of these visits increasing sharply after the first atomic weapon test in 1945. Citing anecdotal evidence, he intimated the Air Force may have attained and adapted some aspect of the alien technology: its method of propulsion and perhaps its source of power. He believed the Air Force or the US Government would eventually reveal these technologies to the public when the Soviet Union was no longer a threat.
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