Apollo 14 astronaut Edgar Mitchell, founder of the Institute of Noetic Sciences research group, has described Mr Hellyer's theory as an 'important contribution' to literature.
â€˜His experience in government, his interest in exo-politics and the issues of sustainability of civilization are significant areas of current discourse,' he said.
Retired Army Colonel John Alexander, also speaking at this weekâ€™s conference, believes UFOs are real but says there has never been a cover-up.
Mr Hellyer added: â€˜People keep talking about transparency and still not telling the truth, and this applies in various other areas as well as UFOs.
'It's just about time that we started getting open with each other and trying to get along and live together.â€™
He said he would 'probably be open-mouthed about it' and 'might get fired for it' if he talked about his opinions in office today.
He said in 2005 that the U.S. military was preparing weapons to use against aliens, and they 'could get us into an intergalactic war without us ever having any warning'.
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I've heard similar things as personally relayed to me by a retired air force colonel I worked with a number of years ago. I believed it too, there was no logical reason to fabricate something like that.