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For the final time in history, two shuttles are on the launch pad, with Endeavour on Pad 39B (background) having rolled out the morning of April 17 to serve as the potential rescue vehicle for Atlantis (foreground, Pad 39A) on the final Hubble Servicing Mission in May.

While two shuttles have been on the respective pads at the same time some 19 times since the shuttle program began in 1981 and Pad B first became active in December 1985, for just the fourth time ever on April 17,  both towers are rolled back, revealing the two orbiters side by side. Once Atlantis is deemed safe to return, Endeavour will be moved to pad A for the next space station mission.