Stock Photo - Milt Heflin, associate director (technical) of the Johnson Space Center, stands under the wing of the space shuttle Atlantis after it landed on July 21, 2011 at the Kennedy Space Center in Florida. The landing completed STS-135, the final mission of the NASA Space Shuttle Program. PhotoHouston Chronicle, Smiley N. Pool

Stock Photo: Milt Heflin, associate director (technical) of the Johnson Space Center, stands under the wing of the space shuttle Atlantis after it landed on July 21.

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