(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.
(c) An enlisted member who becomes a member of the Army Reserve or the Air Force Reserve under this section ceases to be a member of the Army National Guard of the United States or the Air National Guard of the United States, as the case may be.
Structure US Code
Subtitle E— Reserve Components
CHAPTER 1203— ENLISTED MEMBERS
§ 12102. Reserve components: qualifications
§ 12103. Reserve components: terms
§ 12104. Reserve components: transfers
§ 12105. Army Reserve and Air Force Reserve: transfer from Guard components
§ 12106. Army and Air Force Reserve: transfer to upon withdrawal as member of National Guard
§ 12108. Enlisted members: discharge or retirement for years of service or for age