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KENNEDY SPACE CENTER, FLA. - The STS-115 crew members complete their suitup in the White Room before entering Space Shuttle Atlantis on Launch Pad 39B for a simulated launch countdown. Shown here is Commander Brent Jett. The White Room, which is located at the end of the orbiter access arm, allows entry into the orbiter through the crew access hatch. The mission crew is at KSC for Terminal Countdown Demonstration Test (TCDT) activities that are preparation for launch. Liftoff of Atlantis is 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/Jim Grossmann