This subpart establishes the authority of the Space Shuttle commander to enforce order and discipline during all flight phases of a Shuttle flight to take whatever action in his/her judgment is necessary for the protection, safety, and well-being of all personnel and on-board equipment, including the Space Shuttle elements and payloads. During the final launch countdown, following crew ingress, the Space Shuttle commander has the authority to enforce order and discipline among all on-board personnel. During emergency situations prior to liftoff the Space Shuttle commander has the authority to take whatever action in his/her judgment is necessary for the protection or security, safety, and well-being of all personnel on board. [56 FR 27899, June 18, 1991]