The X-37B program is demonstrating a reliable, reusable unmanned space test platform for the Air Force. Its objectives include space experimentation, risk reduction, and concept-of-operations development for reusable space vehicle technologies that could become key enablers for future space missions. Previously, the space shuttle was the only space vehicle capable of returning to Earth and being reused. The innovative X-37B combines the best of an aircraft and a spacecraft into an affordable, responsive unmanned vehicle.