CFR›Title 5›Chapter VI›Part 1603 ContainsSections 1603.1–1603.3CorpusDaily eCFRDisplayed edition2026-04-15Last updated2026-04-15 PART 1603—VESTING Sections 1603.1 § 1603.1 Definitions. 1603.2 § 1603.2 Basic vesting rules. 1603.3 § 1603.3 Service requirements. Authority5 U.S.C. 8432(g), 8432b(h)(1), 8474(b)(5) and (c)(1).Source52 FR 29835, Aug. 12, 1987, unless otherwise noted. Previous 1601 Part 1601—Participants' Choices of TSP Funds Next 1605 Part 1605—Correction of Administrative Errors