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KENNEDY SPACE CENTER, FLA. -- Bill Gerstenmaier, NASA associate administrator for Space Operations; Sigmar Wittig, head of the DLR, the German Space Agency; Mike Griffin, NASA administrator; and Michel Tognini, head of the European Astronaut Center, examine the thermal protection system tiles beneath Space Shuttle Discovery following the landing of mission STS-116 on Runway 15 at NASA Kennedy Space Center's Shuttle Landing Facility. During the STS-116 mission, three spacewalks attached the P5 integrated truss structure to the station, and completed the rewiring of the orbiting laboratory's po…