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CAPE CANAVERAL, Fla. -- On Launch Pad 39A at NASA's Kennedy Space Center, the STS-124 crew stands for a phot on the 205-foot level of the fixed service structure. From left are Mission Specialists Ron Garan, Karen Nyberg, Akihiko Hoshide and Mike Fossum, Commander Mark Kelly, Pilot Ken Ham and Mission Specialist Greg Chamitoff. Behind them can be seen the orange external tank and top of a solid rocket booster. The crew is completing the launch dress rehearsal known as the terminal countdown demonstration test. TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including a simulated launch countdown, equipment familiarization and emergency egress training. On the STS-124 mission, the crew will deliver and install the Japanese Experiment Module – Pressurized Module and Japanese Remote Manipulator System. Discovery's launch is targeted for May 31. Photo credit: NASA/Kim Shiflett