(a) The adjutant general and, when designated by him, the deputy adjutant general, chief of staff, state judge advocate, or commanding officer may remit or suspend any part or amount of the unexecuted part of any sentence, including all uncollected forfeitures other than a sentence approved by the governor.

(b) The adjutant general, for good cause, may substitute an administrative form of discharge for a discharge or dismissal executed in accordance with the sentence of a court-martial.