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An Air Force Flight Test Center B-52H Stratofortress performs a captive carry flight of the X-51A WaveRider Dec. 9, 2009, over Edwards Air Force Base, Calif. The captive carry mission is a key test milestone to ready to light the X-51's scramjet engine during the vehicle's first powered hypersonic flight in early 2010. (Photo: U.S. Air Force photo/Mike Cassidy)
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