STS-92 was an International Space Station assembly mission flown by Space Shuttle Discovery in October 2000. NASA designated the flight ISS Assembly Flight 3A, and the crew delivered the Zenith Z1 truss and Pressurized Mating Adapter 3 to the young station. The mission docked with an uncrewed ISS, then combined robotic arm work, internal outfitting, cargo transfer, and four spacewalks to prepare the complex for its first resident crew. Koichi Wakata operated Discovery's robotic arm for major assembly moves, while the EVA teams connected power, communications, converter, berthing, and external hardware. STS-92 was also the 100th Space Shuttle mission, linking a program milestone with a major step in ISS construction.