Steven Macon Greer is an American retired physician and ufologist who founded the Center for the Study of Extraterrestrial Intelligence and the Disclosure Project. In this clip from the Alien Cosmic Expo 2017, Greer discusses some of the reasons behind making his latest documentary, which exposes the Unacknowledged Special Access Projects (USAPS) and the UFO coverup that began back in Roswell in the 1940's.
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