During this flight, Challenger deployed two communications satellites for Western Union and Indonesia, and McCandless became the first person to perform a free-flying, untethered spacewalk. Challenger conducted the first Space Shuttle landing at the Kennedy Space Center and was the first Shuttle flight to use the new numbering scheme. Since the Shuttle was supposed to launch from both Florida and California, NASA switched to STS-41-B numbering scheme where the first number after "STS-" was the fiscal year of the program the mission was to fly in; the second number was either a "1" for Kennedy or a "2" for Vandenberg Air Force Base, California; and the "-letter" was the order the missions for a particular fiscal year and launch site were originally planned in. Thus, STS-41-B was the second planned launch from the Kennedy Space Center in the fourth year of the program.