The Expedition Three crew poses in front of Space Shuttle Discovery on Launch Pad 39A.

The Expedition Three crew poses in front of Space Shuttle Discovery on Launch Pad 39A. From left are cosmonauts Mikhail Tyurin and Vladimir Nikolaevich Dezhurov and Commander Frank Culbertson. Along with the STS-105 crew, they are taking part in Terminal Countdown Demonstration Test activities, which include emergency egress from the pad, 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 Discovery. The current Expedition Two crew members on the Station will return to Earth on Discovery. Launch of Discovery is scheduled no earlier than Aug. 9, 2001