
X-37B: The Air Force's Mysterious Space Plane
A look at the U.S. Air Force's unmanned X-37B space plane, which has flown four secret, long-duration missions in Earth orbit to date.
Military forces have a long association with spaceflight, with modern rockets evolving from missiles developed during World War II. Today's armed forces rely on space-based assets for reconnaissance, weather tracking, communication, navigation and more. The U.S. Air Force regularly launches GPS and missile-defense tracking satellites, and operates two classified X-37B robotic space planes. Learn more about military satellites, space weapon, the Space Force and more here.
Related Topics: NASA