"Above: Aiming to fill an Air Force requirement to place a satellite in space and return within one orbit, a mission once considered for the Shuttle, the operational X-40A would have been capable of carrying up to 1,200lb of cargo for tactical reconnaissance, refilling gaps in satellite constellations (eg Global Position System), providing identification and surveillance of other space objects or as an escort ship for in-orbit assets. (Photo, NASA-DFRC). Below: Engineers and technicians assess the exterior integrity of the X-37B as it is made ready for a simulated test. To be launched in early 2008, the vehicle will provide the Air Force with a research platform for evaluating the optimum configurations of a definitive aerospace delivery vehicle. Autonomy will be a key part of the systems design. (Photo, USAF)." 
