The Directorate is also a collaborator with DARPA, the U.S. Air Force Space and Missile Systems Center, Sandia National Laboratories and AFRL's Space Vehicles Directorate on the FALCON program, which includes the HTV-3X Blackswift hypersonic flight demonstration vehicle. The Air Vehicles Directorate also collaborated with NASA and Boeing on the initial work for the X-37B Orbital Test Vehicle and the 80% scaled version, X-40A Space Maneuver Vehicle, prior to the classification of the program and its transfer from NASA to DARPA in late 2004. The X-37 program is now managed by the Air Force Rapid Capabilities Office.