5 CFR 1603.1 - Definitions.
(a) Definitions generally applicable to the Thrift Savings Plan are set forth at 5 CFR 1690.1.
(b) As used in this part:
(1) Any non-military service that is creditable under either 5 U.S.C. chapter 83, subchapter III, or 5 U.S.C. 8411. However, that service is to be determined without regard to any time limitations, any deposit or redeposit requirements contained in those statutory provisions after performing the service involved, or any requirement that the individual give written notice of that individual's desire to become subject to the retirement system established by 5 U.S.C. chapters 83 or 84; or
Uniformed services means the Army, Navy, Air Force, Marine Corps, Coast Guard, Public Health Service, and National Oceanic and Atmospheric Administration, as well as members of the Ready Reserve including the National Guard.
Vested means those amounts in an individual account which are nonforfeitable.
Year of service means one full calendar year of service.