X-37B Orbital Test Vehicle 1 
                The Air Force's first unmanned re-entry spacecraft, X-37B Orbital Test Vehicle, landed at 1:16 a.m. Dec. 3, 2010, at Vandenberg Air Force Base, Calif. The X-37B conducted on-orbit experiments for more than 220 days during its maiden voyage. (U.S. Air Force photo/Michael Stonecypher)
                
                    
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