Launched: 2004-02-19. Number crew: 5 .
This would be attached to the end of the US Lab and provide attach locations for the Japanese laboratory, European laboratory, the Centrifuge Accommodation Module and later Multipurpose Logistics Modules.
The future primary docking location for the shuttle would then be a pressurized mating adapter attached to Node 2. With this mission the redefined ISS US Core would have been completed. However due to budget cutbacks it would still not have been able to sustain the six-person crew required for full science missions.
Flight delayed after the Columbia disaster. STS-120 was to have flown ISS Assembly mission ISS-10A. It would have delivered to the station the second of three station connecting modules, Node 2. With this mission the redefined ISS US Core would have been completed.