Advanced re-entry. Unmanned operability. The X-37B is one of the newest and most advanced re-entry spacecraft to operate in low Earth orbit, and itís the first since the Space Shuttle that can return experiments to Earth for further inspection and analysis. The X-37B design combines the best of aircraft and spacecraft capabilities and innovations into an affordable system thatís easy to operate and maintain. The X-37B became the United States' first unmanned vehicle to return from space and land on its own.