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KENNEDY SPACE CENTER, FLA. - STS-115 crew members take another look at an M-113 armored personnel carrier that could be used to move quickly away from the launch pad in the event of an emergency. From left are Commander Brent Jett, Pilot Chris Ferguson and Mission Specialists Heidemarie Stefanyshyn-Piper and Joseph Tanner. In the foreground are Mission Specialists Daniel Burbank and Steven MacLean, who is with the Canadian Space Agency. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch on Space Shuttle Atlantis, scheduled to take place in a window that opens Aug. 27. During their 11-day mission to the International Space Station, the STS-115 crew will continue construction of the station and attach the payload elements, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Cory Huston