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A suit technician helps STS-114 Mission Specialist Stephen Robinson suit up in the Operations and Checkout Building for the trip to Launch Pad 39B for a mock launch countdown culminating in a simulated main engine cutoff. The dress rehearsal is part of Terminal Countdown Demonstration Test (TCDT) activities held prior to each Space Shuttle flight. It provides the crew of each mission an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency egress training. STS-114 is the first Return to Flight mission to the International Space Station. The launch window extends July 13 through July 31.