Reportedly the ex-military guy responsible for Las Vegas disclosed that they were either American or Chinese and used gravity propulsion.
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[quote]disclosed[/quote]Thats a pretty authoritative verb for such an outlandish claim.
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That's why I said reportedly. He also gave confirmation for his identity and it was verified as being who he said he was. Whether he's crazy or not remains to be seem but a lot of other things he said were in fact true.