38 U.S.C. § 3021: Supplemental educational assistance for additional service

serves five or more consecutive years of active duty in the Armed Forces after the years of active duty counted under section 3011(a)(1) of this title without a break in such service; and is discharged from service with an honorable discharge, is placed on the retired list, is transferred to the Fleet Reserve or Fleet Marine Corps Reserve, or is placed on the temporary disability retired list; continues on active duty without a break in service; or is released from active duty for further service in a reserve component of the Armed Forces after service on active duty characterized by the Secretary concerned as honorable service. serves two or more consecutive years of active duty in the Armed Forces after the years of active duty counted under section 3012(a)(1) of this title and four or more consecutive years of duty in the Selected Reserve after the years of duty in the Selected Reserve counted under such section without a break in service; and is discharged from service with an honorable discharge, is placed on the retired list, is transferred to the Fleet Reserve or Fleet Marine Corps Reserve, or is placed on the temporary disability retired list; or continues on active duty or in the Selected Reserve. by any period of time (not to exceed a maximum period prescribed by the Secretary concerned by regulation) during which the member is not able to locate a unit of the Selected Reserve of the member’s Armed Force that the member is eligible to join or that has a vacancy; or by any other period of time (not to exceed a maximum period prescribed by the Secretary concerned by regulation) during which the member is not attached to a unit of the Selected Reserve that the Secretary concerned, pursuant to regulations, considers to be inappropriate to consider for such purpose. A period of active duty or duty in the Selected Reserve that occurs before the period of duty by which the individual concerned qualifies for basic educational assistance may not be counted for purposes of this section.