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摘要

An Air Force X-37B orbital test vehicle returned to Earth after a 674-day classified mission in space. The reusable unmanned spaceplane touched down at Vandenberg AFB, Calif., on Oct. 17, Air Force space officials announced. The mission, OTV-3, was the third and longest space trip to date for the two-vehicle, Boeing-built X-37B fleet. OTV-3 began on Dec. 11, 2012, with the vehicle's launch into orbit from Cape Canaveral AFS, Fla.