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KENNEDY SPACE CENTER, FLA. - STS-114 crew members take part in a mock countdown as pre-launch training included in Terminal Countdown Demonstration Test (TCDT) activities. Seen here in their seats in the mid-deck of Space Shuttle Discovery are (left to right), Mission Specialists Charles Camarda, Wendy Lawrence and Andrew Thomas. TCDT 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.