The term ON SOC. SECURITY refers to the job of a Retirement Examiner (RET), which is a position within the Social Security Administration. The Retirement Examiner is responsible for determining eligibility for retirement benefits and making decisions on claims for Social Security benefits. They also review applications and make recommendations for approval or denial of benefits. The Retirement Examiner must have a thorough understanding of Social Security regulations and policies, as well as the ability to interpret and apply them.