Space Shuttle Challenger / OV-099 | STS-6

STS-6 was the maiden flight of the Space Shuttle Challenger. It deployed the first Tracking and Data Relay Satellite into orbit for NASA, forming an integral part of NASAs in-space 10. It was also the first Space Shuttle mission involving a spacewalk. It was the first mission in which the Extravehicular Mobility Unit (EMU) was used.