What shuttle's first mission was to rescue a stranded communications satellite?

The Space Shuttle Challenger's first mission, STS-6, was launched on April 4, 1983, and its primary objective was to deploy the Tracking and Data Relay Satellite System (TDRSS). However, it was the later mission STS-7 that included a notable rescue operation when the shuttle successfully retrieved the malfunctioning communications satellite, Westar 6, in 1984. This mission marked a significant achievement in satellite servicing and recovery operations for the shuttle program.