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The STS-81 mission flight crew walks out of the Operations and Checkout Building at KSC on their way to Launch Pad 39B during the final phase of the Terminal Countdown Demonstration Test (TCDT) exercises for that mission, a simulated final countdown until just before main engine ignition. They are (from right front): ): Mission Commander Michael A. Baker; Pilot Brent W. Jett, Jr.; and Mission Specialists J.M. "Jerry" Linenger, Peter J. K. "Jeff" Wisoff; John M. Grunsfeld and Marsha S. Ivins. STS- 81 is the fifth Shuttle-Mir docking mission and will feature the transfer of Linenger to Mir to replace astronaut John Blaha, who has been on the orbital laboratory since Sept. 19 after arrival there during the STS-79 mission. During STS-81, Shuttle and Mir crews will conduct risk mitigation, human life science, microgravity and materials processing experiments that will provide data for the design, development and operation of the International Space Station. The primary payload is the SPACEHAB- DM double module will provide space for more than 2,000 pounds of hardware, food and water that will be transferred into the Russian space station during five days of docking operations during the 10-day mission. The SPACEHAB will also be used to return experiment samples from the Mir to Earth for analysis and for microgravity experiments during the mission.