Delgado 2001 : The X-38 program is developing a series of test vehicles to demonstrate the low-cost technologies and methods required to develop a fully functional crew return vehicle that can rapidly return astronauts from onboard the International Space Station to Earth. All the X-38 vehicles employ a windowless cockpit design. This windowless design philosophy and the desire to give crew members and operations personnel as much situational awareness as possible lead to the development of a synthetic vision system. The system provides a simulated real-time 3D perspective. The information displayed on the system is enriched with a wide variety of flight-related information. The major disadvantage of such a system is its limitation to display a synthetic environment using "static" data that was acquired by an aircraft or satellite, at some point in the past. The next generation synthetic environment system being developed, called the "3D heads-up display", will take advantage of a video camera system to fuse live video imagery with the a computer generated synthetic scene. This hybrid system can display a dynamic, real-time scene of the region of interest, enriched by information from a synthetic environment system.