Stock Photo - Dr. Michael Griffin (right), NASA administrator; and William H. Gerstenmaier, associate administrator for Space Operations, inspect the Space Shuttle Discovery after the landing and conclusion of mission STS-121. The 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.

Stock Photo: Dr. Michael Griffin (right), NASA administrator; and William H. Gerstenmaier, associate administrator for Space Operations.

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