Experience refers to paid and unpaid experience, including volunteer work done through National Service..If you are a Federal employee in the competitive service and your agency has notified you in writing..born after December 31, 1959, must complete a Pre-Employment Certification Statement for Selective Service..If you have retired from federal service and you are interested in employment as a reemployed annuitant..you perform a Civilian Permanent Change of Station (PCS) with the government, the Internal Revenue Service