If an officer whose promotion is delayed under paragraph (1) or (2) completes the period of active duty or full-time National Guard duty that the officer is required by law or regulation to perform as a member of a reserve component, the officer may request release from active duty or full-time National Guard duty. If the request is granted, the officer’s promotion shall be effective upon the officer’s release from such duty. The date of rank and position on the reserve active-status list of the officer shall be the date the officer would have been promoted to or recognized in the higher grade had the limitations imposed under regulations prescribed by the Secretary of Defense contained in
section 12011 of this title not existed. If an officer whose promotion is delayed under paragraph (1) or (2) has not completed the period of active duty or full-time National Guard duty that the officer is required by law or regulation to perform as a member of a reserve component, the officer may be retained on active duty or on full-time National Guard duty in the grade in which the officer was serving before the officer’s being found qualified for Federal recognition or the officer’s selection for the promotion until the officer completes that required period of duty.