At least 18 months federal civilian service creditable under FERS. Recognizing the importance of your future, the Federal Government offers a retire ment program that helps provide financial security for you and your family.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. Effective November 14, 2016, the OPM will no longer accept specific forms for retirement if they have errors on them. You must complete the retirement application and supporting documents. Eligible employees do not need to enroll in a specific retirement system. Find what you need to know about the federal campaign finance process. Retirement interests must also comply with Federal law, namely the Employee Retirement. Gov website belongs to an official government organization in the United States.