Boeing space plane returning from year-long secret mission
X-37B Orbital Test Vehicle
Credit: US Air Force
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)
