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KENNEDY SPACE CENTER, FLA. -- The STS-117 crew members stride out of the Operations and Checkout Building as they head for the astrovan to take them to Launch Pad 39A. Leading the way are Pilot Lee Archambault (left) and Commander Frederick Sturckow. Behind them, left and right, are Mission Specialists Patrick Forrester and Steven Swanson, John "Danny" Olivas and astronaut Clayton Anderson, and James Reilly at the rear. Anderson is joining the Expedition 15 crew on the International Space Station; Flight Engineer Suni Williams will return to Earth in his place. Liftoff is scheduled for 7:38 p.m. today aboard Space Shuttle Atlantis. The shuttle is delivering a new segment to the starboard side of the International 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/Kim Shiflett