In 1953, intelligence officer and U.S. Air Force Col. William Odell wrote an unpublished essay entitled "Planet Earth: Host to Extraterrestrial Life." Although the Air Force had cleared the essay for public consumption, writer, UFO investigator and retired U.S. Marine Corps Major Donald Keyhoe, among others, was afraid the essay would cause too much of a stir if released to the public. The essay suggested that the explanation behind the flying saucer mystery was simple: extraterrestrials were colonizing Earth because their planet was dying. 

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Link to FLYING SAUCERS FROM OUTER SPACE by Maj. Donald Keyhoe: Flying Saucers From Outer Space - Chapter XIII (nicap.org)

Link to article about reconstructed essay: Col.O'Dell_&_Invasion_of_Earth.pdf (nicap.org)