2012 · United Launch Alliance
It is the second flight of the first Boeing X-37B vehicle and the third flight of the program. United States Air Force Orbital Test Vehicle is an unmanned 5000 kg, 8.8 m-long reusable mini-spaceplane capable of autonomous re-entry and landing. The specific identity of the spaceship's payload or the mission objectives were not revealed. The mission concluded after 674 days in orbit.