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In the Orbiter Processing Facility (OPF), United Space Alliance (USA) employee Harrell Watts (right) installs Thermal Protection System (TPS) tiles on a main landing gear door of Space Shuttle orbiter Enterprise (OV-101). In the background, other USA employees, members of the OPF midbody TPS crew, prepare to install TPS tile on a simulated orbiter wing. The wing and the sections of Enterprise will be transferred to the Southwest Research Institute for testing after the tile installation is complete. The testing has been requested by the Columbia Accident Investigation Board. Sections of Enterprise were borrowed from the Smithsonian Institution's Air and Space Museum where the orbiter is being stored at the Washington Dulles International Airport. Enterprise was the first orbiter built in the Shuttle fleet and was used to conduct the Approach and Landing Test Program before the first powered Shuttle flight.