An X-51A Waverider hypersonic flight test vehicle is uploaded to an Air Force Flight Test Center B-52 for fit testing at Edwards Air Force Base in California in July 2009. (Associated Press) ** FILE **
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An X-51A Waverider hypersonic flight test vehicle is uploaded to an Air Force Flight Test Center B-52 for fit testing at Edwards Air Force Base in California in July 2009. (Associated Press) ** FILE **
