STS-4 was the fourth NASA Space Shuttle mission, and also the fourth for Space Shuttle Columbia. Carrying a crew of two, the mission launched on Sunday, 27 June, 1982, and landed a week later on 4 July.
STS-4 was the final test flight for the shuttle; it was thereafter officially declared to be operational. Columbia carried numerous scientific payloads during the mission, as well as military missile detection systems.