is the designation for a still-classified U.S. military spaceplane
. Specifications or photos of the program have not been released to the public yet; as a result not much is known about its goals. It has been described as an experimental maneuvering re-entry vehicle capable of transporting a 1,000 lb payload on a suborbital
trajectory at hypersonic
speeds and releasing that payload into the atmosphere
This vehicle is now a part of FALCON (Force Application and Launch from Continental United States) program sponsored by DARPA and NASA.