(03/08/2001) -- Space Shuttle Discovery shines on Launch Pad 39B after rollback of the Rotating Service Structure. Situated above the external tank is the Gaseous Oxygen Vent Arm with the “beanie cap,” a vent hood. Extended out from the Fixed Service Structure (left) to the orbiter is the orbiter access arm with an environmentally controlled chamber, known as the White Room, at the end of the arm. The White Room provides entrance for the astronaut crew into the orbiter. On either side of the tail and main engines are the tail service masts. Rising 31 feet above the Mobile Launcher Platform, the tail masts provide umbilical connections for liquid oxygen and liquid hydrogen lines to fuel the external tank from storage tanks adjacent to the launch pad. Discovery carries the Multi-Purpose Logistics Module Leonardo, the primary delivery system used to resupply and return Station cargo requiring a pressurized environment. Leonardo will deliver up to 10 tons of laboratory racks filled with equipment, experiments and supplies for outfitting the newly installed U.S. Laboratory Destiny. Launch on mission STS-102 is scheduled March 8 at 6:42 a.m. EST