STS-6 was the sixth NASA Space Shuttle mission and the maiden flight of the Space Shuttle Challenger.
Launched from Kennedy Space Center on 4 April 1983, the mission deployed the first Tracking and Data Relay Satellite, TDRS-1, into orbit, before landing at Edwards Air Force Base on 9 April.
STS-6 carried a crew of four – Paul J. Weitz, commander; Karol J. Bobko, pilot; Story Musgrave and Donald H. Peterson, both mission specialists.
Using new spacesuits designed specifically for the Space Shuttle program, Musgrave and Peterson successfully accomplished the program’s first extravehicular activity (EVA) on 7 April 1983, performing various tests in the orbiter’s payload bay.
Source: 7th Day of April – Fatcowco