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X-33 program engineers at NASA's Dryden Flight Research Center, Edwards, California, monitor a flight simulation of the X-33 Advanced Technology Demonstrator as a "flight" unfolds. The simulation provided flight trajectory data while flight control laws are being designed and developed. It also provided information which was to assist X-33 developer Lockheed Martin in aerodynamic design of the vehicle. The X-33 program was a government/industry effort to design, build and fly a half-scale prototype that was to have demonstrated in flight the new technologies needed for Lockheed Martin's proposed full-scale VentureStar Reusable Launch Vehicle.