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KENNEDY SPACE CENTER, Fla. -- STS-105 Pilot Rick Sturckow waits for his helmet during suit check before heading to Launch Pad 39A. The STS-105 and Expedition Three crews are at Kennedy Space Center participating in a Terminal Countdown Demonstration Test, a dress rehearsal for launch. The activities include emergency egress training, a simulated launch countdown and familiarization with the payload. Mission STS-105 will be transporting the Expedition Three crew, several payloads and scientific experiments to the International Space Station aboard Space Shuttle Discovery. The Expedition Two crew members currently on the Station will return to Earth on Discovery. The mission is scheduled to launch no earlier than Aug. 9, 2001