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The payload canister is lifted up the Rotating Service Structure on Launch Pad 39A. At right is Space Shuttle Discovery. Inside the canister are the primary payloads on mission STS-105, the Multi-Purpose Logistics Module Leonardo and the Integrated Cargo Carrier. The ICC holds several smaller payloads, the Early Ammonia Servicer and two experiment containers. The Early Ammonia Servicer consists of two nitrogen tanks that provide compressed gaseous nitrogen to pressurize the ammonia tank and replenish it in the thermal control subsystems of the Space Station. The ICC and MPLM will be lifted into the payload changeout room and then moved into the Discoverys payload bay. The STS-105 mission includes a crew changeover on the International Space Station. Expedition Three will be traveling on Discovery to replace Expedition Two, who will return to Earth on board Discovery. Launch of STS-105 is scheduled for Aug. 9.