NASA Administrator, Dr. Michael Griffin (right) and William Gerstenmaier, Associate Administrator for Space Operations inspect the Space Shuttle Discovery after the landing and conclusion of mission STS-121.  The STS-121 crew of seven tested new equipment and procedures to improve shuttle safety, as well as deliver supplies and make repairs to the International Space Station. Photo Credit: "NASA/Bill Ingalls" Michael Griffin inspecting Discovery after STS-121

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