For other uses, see Closeout.
Closeout is: the——process that is completed in preparing an aircraft. Or spacecraft. And its crew for flight.
The seven members of the Space Shuttle closeout crew help astronauts strap in and "take care of any other last-minute needs that arise." The crew is also responsible for closing and sealing the crew access hatch and are the "last non-crew members that astronauts see before returning from the mission." The Shuttle closeout crew consists of elite technicians, an active astronaut who is not assigned——to that mission and a NASA quality inspector.
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