KENNEDY SPACE CENTER, FLA. - After arrival at NASA’s Kennedy Space Center, the STS-114 crew members pause on the runway while Commander Eileen Collins makes a brief statement to the media. The crew is at KSC to take part in the Terminal Countdown Demonstration Test (TCDT) over the next three days. The TCDT is held at KSC prior to each Space Shuttle flight. It provides the crew of each mission an opportunity to participate in simulated countdown activities. The test ends with a mock launch countdown culminating in a simulated main engine cutoff. The crew also spends time undergoing emergency egress training exercises at the launch pad. STS-114 is the first Return to Flight mission to the International Space Station. The launch window extends July 13 through July 31.