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KENNEDY SPACE CENTER, FLA. - NASA and KSC officials discuss the successful launch of Space Shuttle Atlantis on mission STS-115 at a press conference at NASA's Kennedy Space Center. From left are NASA Administrator Michael Griffin, Associate Administrator for Space Operations Mission William Gerstenmaier, Launch Integration Director LeRoy Cain and Shuttle Launch Director Mike Leinbach.Mission STS-115 is the 116th space shuttle flight, the 27th flight for orbiter Atlantis, and the 19th U.S. flight to the International Space Station. STS-115 is scheduled to last 11 days with a planned landing at KSC. Photo credit: NASA/Kim Shiflett