A person subject to this title who is drunk on duty shall be punished as a court–martial may direct. A person subject to this title who, as a result of indulgence in an alcoholic beverage or drug, is incapacitated for the proper performance of duty shall be punished as a court–martial may direct. A person subject to this title who is a prisoner and, while in such status, is drunk shall be punished as a court–martial may direct.