This picture provided by the US Air Force shows personnel inspecting the X-37B, the Air Force's first unmanned re-entry spacecraft, after landing on December 3, 2010 at Vandenberg Air Force Base in California. The X-37B, named Orbital Test Vehicle 1 (OTV-1), conducted on-orbit experiments for more than 220 days during its maiden voyage, and fired its orbital maneuver engine in low-earth orbit to perform an autonomous reentry before landing, according to the Air Force. AFP PHOTO/US AIR FORCE/HO ++RESTRICTED TO EDITORIAL USE � NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS++
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