Air Force sends Boeing's mystery shuttle back to space

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The X-37B Orbital Test Vehicle, the Air Force's unmanned, reusable space plane, landed at Vandenberg Air Force Base, Calif., June 16, 2012. OTV-2, which launched from Cape Canaveral Air Force Station, Fla., March 5, 2011, conducted on-orbit experiments for 469 days during its mission. (Boeing photo/ Paul Pinner)