5 CFR 831.2005 - Designation of beneficiary for lump-sum payment.
(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.
(c) A witness to a Designation of Beneficiary is ineligible to receive payment as a beneficiary.
(d) Any person, firm, corporation, or legal entity may be named as beneficiary.
(e) A change of beneficiary may be made at any time and without the knowledge or consent of the previous beneficiary, and this right cannot be waived or restricted.