L. 111???84, div. A, title XIX, ?? 1901(c),Oct. 28, 2009, 123 Stat. 2615, provided that: ???The amendments made by this section [amending this section and section 8422 of this title] shall apply with respect to any annuity, entitlement to which is based on a death or other separation from service occurring on or after the date of enactment of this Act [Oct. 28, 2009].???