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CAPE CANAVERAL, Fla. -- Crew members for space shuttle Discovery's STS-124 mission don their launch and entry suits before heading to Launch Pad 39A. Mission Specialist Gregory Chamitoff is ready for his helmet. Chamitoff will join the Expedition 17 crew on the International Space Station as a flight engineer, taking the place of astronaut Garrett Reisman, who will return to Earth on Discovery. Chamitoff is making his first shuttle flight. The STS-124 mission is the second of three flights launching components to complete the Japan Aerospace Exploration Agency's Kibo laboratory. The shuttl…