X-37B Orbital Test Vehicle Fact Sheet

The X-37B Orbital Test Vehicle is a reusable robotic spaceplane operated by the United States Space Force, supporting space technology innovation and advancing space capabilities through long-duration space operations. Since its first flight in 2010, the X-37B has conducted seven missions—testing advanced propulsion systems, reusable spacecraft technologies, and military payloads to enhance space security and space situational awareness over extended spaceflights.

Originally a NASA initiative, the program was transferred to DARPA and then the U.S. Air Force before becoming a Space Force asset. Each mission—designated OTV-1 through OTV-7—has tested different technologies and remained on orbit for increasingly long durations, with OTV-6 reaching 908 days. The most recent mission, OTV-7, operated in a highly elliptical orbit reaching nearly 39,000 km and performed aerobraking maneuvers to support orbital debris mitigation and space sustainability before landing in March 2025.

Key observations from the fact sheet:
The X-37B deploys small satellites, including military experiments like FalconSAT-8 and microwave power-beaming tests, contributing to evolving space technology and space operations.
Its payload bay is small, limiting its ability to carry significant counterspace capabilities. There is no public evidence that it has ever approached or interacted with other space objects.
Although the orbit and missions are secretive, publicly available data suggests most activity supports technology development and space policy objectives, not weapons testing.
The vehicle’s maneuverability—including repeated orbit changes and recent aerobraking—demonstrates advanced capabilities, but remains within the scope of responsive space experimentation and responsible behavior in space.
Some missions have raised transparency concerns, particularly with delayed satellite registration and lack of orbital data during flight, highlighting ongoing discussions around space governance and international norms.

See page 2 for full flight history table (OTV-1 to OTV-7), including durations and landing sites. Image of X-37B on runway appears on page 1; orbital rendering of OTV-7 on page 4.