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KENNEDY SPACE CENTER, FLA. -- In the White Room on Launch Pad 39A, STS-117 Mission Specialist Steven Swanson is helped by the closeout crew to secure his launch suit before climbing into Space Shuttle Atlantis. Behind Swanson is astronaut Clayton Anderson, waiting his turn. Anderson is joining the Expedition 15 crew on the International Space Station; Flight Engineer Suni Williams will return to Earth in his place. The mission to the space station is scheduled to launch at 7:38 p.m. EDT. Members of the closeout crew help the astronauts don a parachute pack, strap them into the space shuttle's crew module and take care of any other last-minute needs that arise. The White Room is at the end of the orbiter access arm that extends from the fixed service structure and provides entry into the orbiter. The shuttle is delivering a new segment to the starboard side of the space station's backbone, known as the truss. Three spacewalks are planned to install the S3/S4 truss segment, deploy a set of solar arrays and prepare them for operation. STS-117 is the 118th space shuttle flight, the 21st flight to the station, the 28th flight for Atlantis and the first of four flights planned for 2007. Photo credit: NASA/Tony Gray & Don Kight