(04/06/2000) -- During a break in their Terminal Countdown Demonstration Test (TCDT), the STS-101 crew poses in front of Space Shuttle Atlantis at Launch Pad 39A. Standing, left to right, are Mission Specialists Susan J. Helms and Yury Usachev of Russia; Pilot Scott J. 'Doc' Horowitz; Commander James D. Halsell Jr.; and Mission Specialists Mary Ellen Weber, James Voss and Jeffrey N. Williams. The TCDT includes emergency egress training and a simulated launch countdown. 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