The STS-101 crew take part in training during a Terminal Countdown Demonstration Test TCDT.

Inside the White Room at Launch Pad 39A, the STS-101 crew take part in training during a Terminal Countdown Demonstration Test (TCDT). Activities during TCDT include emergency egress from the orbiter and a dress rehearsal for launch. Standing left to right are Pilot Scott Horowitz, Mission Specialists Mary Ellen Weber, Yury Usachev and Jeffrey Williams, Commander James Halsell, and Mission Specialists James Voss and Susan Helms. During their mission to the International Space Station, the STS-101 crew will be delivering logistics and supplies, plus preparing the Station for the arrival of the Zvezda Service Module, expected to be launched by Russia in July 2000. Also, the crew will conduct one space walk to perform maintenance on the Space Station. This will be the third assembly flight for the Space Station. STS-101 is scheduled to launch April 24 at 4:15 p.m. from Launch Pad 39A