5 U.S.C. § 8413 - U.S. Code - Unannotated Title 5. Government Organization and Employees § 8413. Deferred retirement

(b)(1) An employee or Member who is separated from the service, or transferred to a position in which the employee or Member does not continue subject to this chapter, after completing 10 years of service but before attaining the applicable minimum retirement age under section 8412(h) is entitled to an annuity beginning on the date designated by the employee or Member in a written election under this subsection. The date designated under this subsection may not precede the date on which the employee or Member attains such minimum retirement age and must precede the date on which the employee or Member becomes 62 years of age.

(2) The election of an annuity under this subsection shall not be effective unless--

(3) The election of an annuity under this subsection extinguishes the right of the employee or Member to receive any other annuity based on the service on which the annuity under this subsection is based.