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KENNEDY SPACE CENTER, FLA. - The STS-115 crew walks out of the Operations and Checkout Building to head for Launch Pad 39B. Leading the way on the left is Pilot Christopher Ferguson; behind him are Mission Specialists Steven MacLean and Heidemarie Stefanyshyn-Piper. Leading on the right is Commander Brent Jett; behind him re Mission Specialists Daniel Burbank and Joseph Tanner. MacLean is with the Canadian Space Agency. They are taking part in a simulated launch countdown as part of the preparation for the liftoff of Space Shuttle Atlantis on mission STS-115, scheduled to take place in a window that opens Aug. 27. The mission crew has been at KSC for Terminal Countdown Demonstration Test (TCDT) activities, which include emergency egress training and the simulation. During their 11-day mission to the International Space Station, the 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 courtesy of Scott Andrews/Nikon