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KENNEDY SPACE CENTER, FLA. - Workers check on the crawler-transporters in the event they are needed for rolling back Space Shuttle Atlantis from Launch Pad 39B. Crawler No. 2 will be used to move the STS-116 stack from VAB high bay 3 to high bay 2 and crawler No. 1 will be used to transport Atlantis to high bay 3. The rollback will be determined by the mission management team based on information about Hurricane Ernesto and its path through Florida. Atlantis has been poised on Launch Pad 39B for liftoff on mission STS-115 to the International Space Station to deliver the P3/P4 truss segment. Photo credit: NASA/Jack Pfaller