KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Robert L. Behnken is waiting for help with his launch and entry suit before entering space shuttle Endeavour. He and the other STS-123 crew members are getting ready for the simulated launch countdown, which is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Mike Foreman gets help with his launch and entry suit before entering space shuttle Endeavour. He and the other STS-123 crew members are getting ready for the simulated launch countdown, which is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Garrett Reisman works at putting on his gloves while suiting up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- Before the simulated launch countdown in space shuttle Endeavour, STS-123 Commander Dominic Gorie (left) and Pilot Gregory H. Johnson pose in front of Endeavour's solid rocket booster and external tank on NASA Kennedy Space Center's Launch Pad 39A. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Rick Linnehan is fully suited for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- On NASA Kennedy Space Center's Launch Pad 39A, space shuttle Endeavour's payload bay is ready for closure of the doors for launch. Seen at the bottom is the first section of the Japan Aerospace Exploration Agency's Kibo laboratory, the Experiment Logistics Module Pressurized Section, or ELM-PS. At the top is the orbiter docking system. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the ELM-PS and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Robert L. Behnken is waiting for help with his launch and entry suit before entering space shuttle Endeavour. He and other crew members are getting ready for the simulated launch countdown, which is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Garrett Reisman is helped with his launch and entry suit before entering space shuttle Endeavour for the simulated launch countdown. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Robert L. Behnken dons his helmet while suiting up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Takao Doi tries on his helmet during suitup for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. Doi represents the Japan Aerospace Exploration Agency, or JAXA. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- On NASA Kennedy Space Center's Launch Pad 39A, a worker stands by as one of space shuttle Endeavour's payload bay doors closes. Still seen, at the bottom of the payload bay, is the first section of the Japan Aerospace Exploration Agency's Kibo laboratory, the Experiment Logistics Module Pressurized Section, or ELM-PS. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the ELM-PS and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. -- STS-123 Pilot Gregory H. Johnson tests the communications in his helmet before the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- On NASA Kennedy Space Center's Launch Pad 39A, workers check the fittings around space shuttle Endeavour's payload bay doors after closing. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the ELM-PS and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Takao Doi, who represents the Japan Aerospace Exploration Agency, gets help with his launch and entry suit before entering space shuttle Endeavour. Behind him is Mission Specialist Robert L. Behnken. Both are getting ready for the simulated launch countdown, which is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- The crew of mission STS-123 eagerly leave the Operations and Checkout Building on their way to NASA Kennedy Space Center's Launch Pad 39A. In front, from left, are Pilot Gregory H. Johnson, Mission Specialist Garrett Reisman and Commander Dominic Gorie. Behind them, from left, are Mission Specialists Robert L. Behnken, Takao Doi, Mike Foreman and Rick Linnehan. The crew is taking part in a simulated launch countdown, the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- The crew of mission STS-123 show their readiness to take part in a simulated launch countdown, the culmination of the terminal countdown demonstration test, or TCDT. From left are Mission Specialists Rick Linnehan, Takao Doi, Robert L. Behnken and Mike Foreman, Pilot Gregory H. Johnson, Mission Specialist Garrett Reisman and Commander Dominic Gorie. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Mike Foreman is ready to finish suiting up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Commander Dominic Gorie is testing his helmet while suiting up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Pilot Gregory H. Johnson is ready to finish suiting up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- On NASA Kennedy Space Center's Launch Pad 39A, two workers keep watch as the second payload bay door closes on space shuttle Endeavour. Still seen, at the bottom of the payload bay, is the first section of the Japan Aerospace Exploration Agency's Kibo laboratory, the Experiment Logistics Module Pressurized Section, or ELM-PS. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the ELM-PS and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. -- Before the simulated launch countdown in space shuttle Endeavour, the STS-123 crew gathers near the top of the fixed service structure on NASA Kennedy Space Center's Launch Pad 39A. Seen from left are Mission Specialists Rick Linnehan and Robert L. Behnken, Pilot Gregory H. Johnson, Commander Dominic Gorie and Mission Specialists Mike Foreman, Garrett Reisman and Takao Doi. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- Before the simulated launch countdown in space shuttle Endeavour, the STS-123 crew gathers near the top of the fixed service structure on NASA Kennedy Space Center's Launch Pad 39A. Seen from left are Mission Specialists Rick Linnehan and Robert L. Behnken, Pilot Gregory H. Johnson, Commander Dominic Gorie and Mission Specialists Mike Foreman, Garrett Reisman and Takao Doi. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Takao Doi is helped with his boots during suitup for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. Doi represents the Japan Aerospace and Exploration Agency, or JAXA. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Garrett Reisman is helped with his launch and entry suit before entering space shuttle Endeavour for the simulated launch countdown. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Takao Doi, who represents the Japan Aerospace Exploration Agency, gets help with his launch and entry suit before entering space shuttle Endeavour. He and the other STS-123 crew members are getting ready for the simulated launch countdown, which is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Pilot Gregory H. Johnson is in the White Room on NASA Kennedy Space Center's Launch Pad 39A, getting ready to enter space shuttle Endeavour for the simulated launch countdown. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Mission Specialist Rick Linnehan is getting ready to enter space shuttle Endeavour for the simulated launch countdown. Behind him is Mission Specialist Pilot Gregory H. Johnson. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- The crew of mission STS-123 provides a photo opportunity in front of the Astrovan for spectators before heading out to NASA Kennedy Space Center's Launch Pad 39A. From left are Mission Specialists Rick Linnehan, Takao Doi, Robert L. Behnken and Mike Foreman, Pilot Gregory H. Johnson, Mission Specialist Garrett Reisman and Commander Dominic Gorie. The crew is taking part in a simulated launch countdown, the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Pilot Gregory H. Johnson (left) and Mission Specialist Rick Linnehan pause in front space shuttle Endeavour's open hatch. They are getting ready to enter Endeavour for the simulated launch countdown, which is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Mike Foreman tests the communications in his helmet before the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Garrett Reisman tests the communications in his helmet while suiting up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- In the White Room on NASA Kennedy Space Center's Launch Pad 39A, STS-123 Pilot Gregory H. Johnson and Mission Specialist Garrett Reisman pause in front of space shuttle Endeavour's open hatch. They are getting ready to enter Endeavour for the simulated launch countdown, which is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- STS-123 Commander Dominic Gorie tests the communications in his helmet before the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Commander Dominic Gorie is helped with his launch and entry suit before entering space shuttle Endeavour for the simulated launch countdown. The countdown is the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various countdown activities, including equipment familiarization and emergency egress training. Endeavour is targeted to launch at 2:28 a.m. EDT March 11 on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Jim Grossmann

KENNEDY SPACE CENTER, FLA. -- On NASA Kennedy Space Center's Launch Pad 39A, a worker keeps watch as space shuttle Endeavour's payload bay doors begin closing for launch. Seen at the bottom of the payload bay is the first section of the Japan Aerospace Exploration Agency's Kibo laboratory, the Experiment Logistics Module Pressurized Section, or ELM-PS. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the ELM-PS and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Takao Doi suits up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. Doi represents the Japan Aerospace Exploration Agency, or JAXA. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Robert L. Behnken is fully suited for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- On NASA Kennedy Space Center's Launch Pad 39A, one of space shuttle Endeavour's payload bay doors, at left, is closing to prepare for launch. Seen at the bottom is the first section of the Japan Aerospace Exploration Agency's Kibo laboratory, the Experiment Logistics Module Pressurized Section, or ELM-PS. Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the ELM-PS and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Dimitri Gerondidakis

KENNEDY SPACE CENTER, FLA. -- The crew of mission STS-123 waves to spectators as they head for the Astrovan to take them to NASA Kennedy Space Center's Launch Pad 39A. In front, from left, are Pilot Gregory H. Johnson, Mission Specialist Garrett Reisman and Commander Dominic Gorie. Behind them, from left, are Mission Specialists Robert L. Behnken, Takao Doi, Mike Foreman and Rick Linnehan. The crew is taking part in a simulated launch countdown, the culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Garrett Reisman is helped with his helmet while suiting up for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT. The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett

KENNEDY SPACE CENTER, FLA. -- STS-123 Mission Specialist Garrett Reisman dons his launch and entry suit for the launch dress rehearsal, culmination of the terminal countdown demonstration test, or TCDT.The TCDT provides astronauts and ground crews with an opportunity to participate in various simulated countdown activities, including equipment familiarization and emergency training. Space shuttle Endeavour is targeted to launch March 11 at 2:28 a.m. EDT on the 16-day STS-123 mission to the International Space Station. Endeavour and its crew will deliver the first section of the Japan Aerospace Exploration Agency's Kibo laboratory and the Canadian Space Agency's two-armed robotic system, Dextre. Photo credit: NASA/Kim Shiflett