§ 302. Enlistments, reenlistments, and extensions
(a)
Under regulations to be prescribed by the Secretary concerned, original enlistments in the National Guard may be accepted for—
(b)
Under regulations to be prescribed by the Secretary concerned, reenlistment in the National Guard may be accepted for any specified period, or, if the person last served in one of the highest five enlisted grades, for an unspecified period.
(c)
Enlistments or reenlistments in the National Guard may be extended—