U.S. Code / Title 5 — Government Organization and… / Part III—Employees / Subpart G—Insurance and Annuities / Chapter 84—Federal Employees’ Retirement SystemTitle 5SubchapterSubchapter I—General ProvisionsContents§ 8401. Definitions§ 8402. Federal Employees' Retirement System; exclusions§ 8403. Relationship to the Social Security Act