(b) When a previously executed sentence of dishonorable discharge or bad-conduct discharge is not sustained on a new trial, the adjutant general shall substitute therefor a form of discharge authorized for administrative issuance unless the accused is to serve out the remainder of his enlistment.
(c) When a previously executed sentence of dismissal is not sustained on a new trial, the adjutant general shall substitute therefor a form of discharge authorized for administrative issue.