Retirement plan guides for all Department of Retirement System plans including rules and benefit information for Washington State DRS pension customers. PERS Plan 3 is a 401(a) plan with two parts: pension and investment.Your employer contributes to your pension, and you contribute to the investment account. The Department of Retirement Systems (DRS) offers a wide range of resources to help you understand your retirement plan and meet your retirement savings goals. You are eligible to retire with a full benefit if you have at least five years of service credit when you meet the age requirement. The County offers its employees several opportunities to save for the future, including a pension through the Washington State Department of Retirement Systems. Plan 3 has two parts—a pension benefit and an investment account. Your employer contributes to your pension benefit. This booklet helps you understand your plan and explains what information you should review periodically and where to go for help with questions. Once vested, you are eligible to retire with a full benefit at age 65.