[Code of Federal Regulations] [Title 5, Volume 2] [Revised as of January 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 5CFR837.804] [Page 186] TITLE 5--ADMINISTRATIVE PERSONNEL CHAPTER I--OFFICE OF PERSONNEL MANAGEMENT (CONTINUED) PART 837_REEMPLOYMENT OF ANNUITANTS--Table of Contents Subpart H_Alternative Entitlements and Canceled Retirements Sec. 837.804 Finality of elections under this subpart. Except as otherwise provided by this subpart, an election of coverage under, or annuity from, another retirement system, in lieu of CSRS or FERS coverage or annuity, or the election between simultaneous entitlements under CSRS or FERS, is final and conclusive for the period of simultaneous entitlement to coverage or annuity.