STS-41B Mission Patch

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10th Space Shuttle Mission 4th Flight of Challenger Crew: Vance D. Brand, Commander Robert L. Gibson, Pilot Bruce McCandless II, Mission Specialist Ronald E. McNair, Mission Specia list Robert L. Stewart, Mission Specialist The mission featured the first untethered spacewalks, which were performed by astronauts McCandless and Stewart using Manned Maneuvering Units (MMU). WESTAR-VI and PALAPA-B2 satellites were deployed, but failure of the PAM-D rocket motors left them in improper low-earth orbits. Show more