The following chart outlines the requirements for an immediate annuity under the Federal Employees. Retirement System (FERS).We Do Retirement Right​​ Since 1967, counties and districts in Texas have trusted TCDRS to provide retirement, disability and survivor benefits. Bexar County offers employees a competitive salary, retirement, and benefits. The Bexar County retirement system provides benefits for retired firefighters and police officers. If you have not reached your 20 years covered Law Enforcement or Fire Fighter service and reach the age 57, you must retire in the month you reach your 20 years. All full-time civilian City of San Antonio employees and their eligible dependents have the ability to participate in the Civilian Benefits Program. Employees become vested after five (5) years of service. Criteria for retirement: Five (5) years of service at age 60, or 20 years of service at any age. USAJOBS is a United States Office of Personnel Management website.