142.—Every person subject to military law who, whether on duty or not on duty, is drunk is guilty of an offence against military law and shall, on conviction by court-martial, be liable to suffer,—
(a) if an officer, dismissal from the Defence Forces or any less punishment awardable by a court-martial, or
(b) if a man and the offence is committed on active service or on duty, imprisonment or any less punishment awardable by a court-martial, or
(c) if a man and the offence is committed not on active service or on duty, detention for a period not exceeding ninety days or any less punishment awardable by a court-martial.