Technicians in self-contained atmospheric protective ensemble suits conduct initial checks on the X-37B Orbital Test Vehicle 1 after its landing 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) (Photo by DoD/Corbis via Getty Images)
The X-37B Orbital Test Vehicle sits on the runway during post-landing operations 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. It fired its orbital maneuver engine in low-earth orbit to perform an autonomous reentry before landing. (U.S. Air Force photo/Michael Stonecypher) (Photo by DoD/Corbis via Getty Images)
The X-37B Orbital Test Vehicle sits on the runway during post-landing operations Dec. 3, 2010, at Vandenberg Air Force Base, Calif. Technicians in self-contained atmospheric protective ensemble suits conducted initial checks on the vehicle and to ensure the area was safe. (U.S. Air Force photo/Michael Stonecypher) (Photo by DoD/Corbis via Getty Images)
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) (Photo by DoD/Corbis via Getty Images)
