(a)
An enlisted member of the Army National Guard of the United States who ceases to be a member of the Army National Guard becomes a member of the Army Reserve unless he is also discharged from his enlistment as a Reserve.
(b)
An enlisted member of the Air National Guard of the United States who ceases to be a member of the Air National Guard becomes a member of the Air Force Reserve unless he is also discharged from his enlistment as a Reserve.