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In November 1999, McCulley was named Chief Operating Officer (COO) of United Space Alliance (USA). In this role, he had primary responsibility for the day-to-day operations and overall management of USA, the Prime Contractor for the Space Shuttle program. Prior to being named COO, McCulley was Vice President and Deputy Program Manager for the Space Flight Operations Contract (SFOC), where he assisted USA's Vice President and Program Manager in the management of the Space Shuttle program.