The STS-101 crew poses on the tarmac after arriving to take part in a Terminal Countdown Demonstration Test TCDT.

The STS-101 crew poses on the tarmac at the Shuttle Landing Facility after arriving to take part in a Terminal Countdown Demonstration Test (TCDT). The two days of activities include emergency egress training and a dress rehearsal for launch. Standing left to right are Mission Specialist Susan Helms, Commander James Halsell, Pilot Scott Horowitz, and Mission Speciaists Jeffrey Williams, James Voss, Yury Usachev and Mary Ellen Weber. 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