14 C.F.R. § 1214.700
This subpart establishes the authority of the NASA Commander of a NASA mission, excluding missions related to the ISS and activities licensed under Title 51 U.S.C. Chapter 509, to enforce order and discipline during a mission and to take whatever action in his/her judgment is reasonable and necessary for the protection, safety, and well-being of all personnel and on-board equipment, including the spacecraft and payloads. During the final launch countdown, following crew ingress, the NASA Commander has the authority to enforce order and discipline among all on-board personnel. During emergency situations prior to liftoff, the NASA 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.
14 C.F.R. §1214.700