Indiana Code Title 10. Public Safety § 10-16-6-8

Sec. 8. (a) The period of enlistment in the Indiana national guard is for the time prescribed by national guard regulations.  The qualifications for enlistment must be the same as those prescribed by regulations for admission to the regular army or regular air force or national guard regulations.  However, the privilege of continuing the active service during the whole of an enlistment period and of reenlisting in the service may not be denied except as otherwise provided.

(b) An enlisted person of the Indiana national guard shall sign an enlistment contract and take and subscribe to the oath required by national guard regulations.

(c) A federally recognized officer of the Indiana national guard may administer the enlistment oath.

(d) The adjutant general may authorize officers of the services on duty at armed forces entrance stations to administer the oath of enlistment to an applicant presented to them by an authorized representative of the Indiana national guard for enlistment in the Indiana national guard.  The state adjutant general's authorization must be in writing.