X-37 Orbital Test Vehicle airplane model. The X-37 is a highly classified military project. All that is known about this aircraft, is it operates in orbit and returns to earth much like the space shuttle. It is unmanned. The Boeing X-37, also known as the Orbital Test Vehicle, is a reusable robotic spacecraft. It is boosted into space by a launch vehicle, then re-enters Earth's atmosphere and lands as a spaceplane. The X-37 is operated by the United States Space Force and was previously operated by Air Force Space Command until 2019 for orbital spaceflight missions intended to demonstrate reusable space technologies.