5 CFR § 838.802
CSRS limitations
November 4, 2020
(a) A court order awarding a former spouse survivor annuity under CSRS is not a court order acceptable for processing unless the marriage terminated on or after May 7, 1985.
(b) In the case of a retiree who retired under CSRS before May 7, 1985, a court order awarding a former spouse survivor annuity under CSRS is not a court order acceptable for processing unless the retiree was receiving a reduced annuity to provide a survivor annuity to benefit that spouse on May 7, 1985.