38 CFR §21.340

1. (a)General. VA may approve leaves of absence under certain conditions. During approved leaves of absence, a veteran in receipt of subsistence allowance shall be considered to be pursuing a rehabilitation program. Leave may be authorized for a veteran during a period of:
   1. (1)Rehabilitation to the point of employability;
   2. (2)Extended evaluation; or
   3. (3)Independent living services.
2. (b)Election of subsistence allowance. If a veteran elects to receive subsistence allowance and payment of rehabilitation services by VA, he or she may be authorized leave of absence under §§ 21.342 through 21.350.
3. (c)Election of benefits at the chapter 30 rate. If a veteran elects to receive a subsistence allowance paid at the chapter 30 rate, the effect of absences is determined under §§ 21.7139 and 21.7154.