5 CFR 831.2005 - Designation of beneficiary for lump-sum payment.
(a) The Designation of Beneficiary must be in writing, signed, and witnessed,and received in OPM before the death of the designator.
(b) No change or cancellation of beneficiary in a last will or testament, or in any other document not witnessed and filed as required by this section, has any force or effect.
Title 5 published on 2014-01-01
no entries appear in the Federal Register after this date.