CSRS Offset Retirement
Snippet of Article: "...Typically, CSRS Offset retirement applies to employees who had a break in service that exceeded 1 year and ended after 1983, and had 5 years of credit able civil ian service as of January 1, 1987. For example, if you left Federal service on May 15, 1992, with 18 years of CSRS-covered service and were rein stated under a career appointment on November 1, 1993, you would have CSRS Offset cover age. An other major category of CSRS Offset employees includes people who were hired before January 1, 1984, acquired CSRS interim cover age between 1984 and 1987, and had at least 5 years of creditable civilian service by January 1, 1987..."
Source: OPM