The STS-115 crew pauses for a photo during training on Launch Pad 39B.

The STS-115 crew pauses for a photo during training on Launch Pad 39B. From left are Mission Commander Brent Jett, Pilot Chris Ferguson, and Mission Specialists Daniel Burbank, Steven MacLean, Heidemarie Stefanyshyn-Piper and Joseph Tanner. 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