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