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KENNEDY SPACE CENTER, FLA. - After their return from space, the STS-115 crew members are exiting the crew transport vehicle on the Shuttle Landing Facility. First out is Commander Brent Jett. Behind him, still inside, are Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner. During the mission, astronauts completed three spacewalks to attach the P3/P4 integrated truss structure to the International Space Station. Main gear touchdown was at 6:21:30 a.m. EDT. Nose gear touchdown was at 6:21:36 a.m. and wheel stop was at 6:22:16 a.m. At touchdown -- nominally about 2,500 ft. be…