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KENNEDY SPACE CENTER, FLA. - Security is on hand as Space Shuttle Atlantis arrives on Launch Pad 39B via the crawler-transporter. Tracks of the crawler can be seen on the crawlerway. At left of the shuttle are the rotating service structure and fixed service structure. The latter holds the 80-foot lightning mast on top, with its catenary wire extending downward to the left, providing lightning protection. The slow speed of the crawler results in a 6- to 8-hour trek to the pad approximately 4 miles away. Atlantis' launch window begins Aug. 27 for an 11-day mission to the International Space Station. The STS-115 crew of six astronauts will continue construction of the station and install their cargo, the Port 3/4 truss segment with its two large solar arrays. Photo credit: NASA/Tony Gray