On Dec. 3, 2010 the Boeing-built X-37B unmanned space vehicle completed its first spaceflight, landing at Vandenberg Air Force Base, in California, after a 220-day mission for the U.S. Air Force. The X-37B is the first unmanned U.S. vehicle to return from space and land on its own and the only space vehicle other than the space shuttle that is capable of returning to earth for reuse, Boeing said. Photo: The Boeing Company