((a)) ** .—** The period of service under an enlistment or period of obligated service while also performing service as a cadet or midshipman or serving as a midshipman in the Navy Reserve may not be counted in computing, for any purpose, the length of service of an officer of an armed force or an officer in the Commissioned Corps of the Public Health Service.
((b)) ** .—** In computing length of service for any purpose, service as a cadet or midshipman may not be credited to any of the following officers:
((1)) An officer of the Navy or Marine Corps.
((2)) A commissioned officer of the Army, Air Force, or Space Force.
((3)) An officer of the Coast Guard.
((4)) An officer in the Commissioned Corps of the Public Health Service.
((c)) ** .—** In this section, the term “service as a cadet or midshipman” means—
((1)) service as a cadet at the United States Military Academy, United States Air Force Academy, or United States Coast Guard Academy; or
((2)) service as a midshipman at the United States Naval Academy.