Expedition Three Commander Frank Culbertson sits through suit fit check as part of Terminal Countdown Demonstration Test activities.

Expedition Three Commander Frank Culbertson happily sits through suit fit check as part of Terminal Countdown Demonstration Test activities. He and fellow crew members Vladimir Nikolaevich Dezhurov and Mikhail Tyurin, both with the Russian Aviation and Space Agency, are taking part in the TCDT along with the STS-105 crew: Commander Scott Horowitz, Pilot Rick Sturckow, and Mission Specialists Daniel Barry and Patrick Forrester. The TCDT also includes emergency egress training and a simulated launch countdown. 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 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