((a)) ** 30 .—** 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.

((b)) ** .—** Subsection (a) applies in the case of a member released from active duty because of a failure to meet—

((1)) physical standards for retention due to a preexisting condition not aggravated during the period of active duty; or

((2)) medical or dental standards for deployment due to a preexisting condition not aggravated during the period of active duty.

((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.