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STS-4 was the fourth mission of NASA's Space Shuttle program and the fourth flight of the Space Shuttle Columbia. It was launched on June 27, 1982, and completed its mission on July 4, 1982.
The primary objectives of STS-4 were to test the performance of the Space Shuttle's systems and subsystems in the actual space environment and to deploy the Long Duration Exposure Facility (LDEF), a satellite that was designed to collect data on the effects of long-term exposure to space on various materials.
STS-4 was the final test flight of the Space Shuttle program before operational missions began. It was the last mission to be commanded by a two-person crew, as all subsequent missions included a crew of at least four people. The mission was successful, and the Space Shuttle program continued to operate until 2011.
