Civilian service means:
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.
Military service means service that is creditable under 37 U.S.C. 205 .
Vested means those amounts in an individual account which are nonforfeitable.
Year of service means one full calendar year of service.
5 C.F.R. §1603.1