(a) Any person subject to this chapter who is drunk on duty shall be punished as directed by a court-martial.
(b) Any person subject to this chapter who, as a result of indulgence in any alcoholic beverage or any drug, is incapacitated for the proper performance of duty shall be punished as directed by a court-martial.
(c) Any person subject to this chapter who is a prisoner and is drunk while the person is a prisoner shall be punished as directed by a court-martial.