For fiscal year 2008 and thereafter, in addition to amounts otherwise provided to the National Service Trust under this heading, at no later than the end of the fifth fiscal year after the fiscal year for which funds are appropriated or otherwise made available, unobligated balances of appropriations available for grants under the National Service Trust Program under subtitle C of title I of the 1990 Act [42 U.S.C. 12571 et seq.] during such fiscal year may be transferred to the National Service Trust after notice is transmitted to Congress, if such funds are initially obligated before the expiration of their period of availability as provided in this Act.