In aerospace, Assembly, Test, and Launch Operations (ATLO), also known as Mission System Integration and Test (MSIT) is the phase of a spacecraft project that comprises building the spacecraft, testing it, and getting it launched.
[1] Pictured to the right is John Wirth (left) and Kieran McKay (right) at Kennedy Space Center with ISS-RapidScat, the radar scatterometer which was built at JPL.
Specifically, they were testing the rotating radar's capabilities at the Space Station Processing Facility.
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