(05/19/2000) --- The STS-101 crew wave to onlookers as they leave the Operations and Checkout Building enroute to Launch Pad 39A for the fourth attempt at launch of Space Shuttle Atlantis. In their orange launch and entry suits, they are (front line, left to right) Pilot Scott J. Horowitz and Commander James D. Halsell Jr.; (second line) Mission Specialists Mary Ellen Weber (only her arm is visible) and Jeffrey N. Williams; and (third line) Mission Specialists Susan J. Helms, Yury Usachev of Russia and James S. Voss The mission will take the crew to the International Space Station to deliver logistics and supplies and to prepare 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 and will reboost the space station from 230 statute miles to 250 statute miles. This will be the third assembly flight to the Space Station. Liftoff of Space Shuttle Atlantis for the 10-day mission is scheduled for about 6:12 a.m. EDT from Launch Pad 39A. Landing is targeted for May 29 at 2:19 a.m. EDT