10 U.S.C. § 1206a

1. (a)A member of a reserve component who is ordered to active duty for a period of more than 30 days and is released from active duty within 30 days of commencing such period of active duty for a reason stated in subsection (b) shall be considered for all purposes under this chapter to have been serving under an order to active duty for a period of 30 days or less.
2. (b)Subsection (a) applies in the case of a member released from active duty because of a failure to meet—
   1. (1)physical standards for retention due to a preexisting condition not aggravated during the period of active duty; or
   2. (2)medical or dental standards for deployment due to a preexisting condition not aggravated during the period of active duty.
3. (c)Notwithstanding subsection (a), any benefit under chapter 55 of this title received by a member described in subsection (a) or a dependent of such member before or during the period of active duty shall not be subject to recoupment or otherwise affected.