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NASA management monitors the countdown of the launch of a SpaceX Falcon 9 rocket carrying the company's Crew Dragon spacecraft on the Demo-1 mission from firing room four of the Launch Control Center, Saturday, March 2, 2019 at the Kennedy Space Center in Florida. The Demo-1 mission is the first launch of a commercially built and operated American spacecraft and space system designed for humans as part of NASA's Commercial Crew Program. The mission will serve as an end-to-end test of the system's capabilities.