((a)) ** Entitlement** A member of the Service—
((1)) who is retired under ; or
((2)) who is retired under section 4007(c)(1) or 4008(b) or 4010a of this title—
((A)) after becoming eligible for voluntary retirement under or any other applicable provision of chapter 84 of title 5, or
((B)) from the Senior Foreign Service or while assigned to class 1 in the Foreign Service Schedule,
((b)) ** Computation of amount; refund; death of member** Any member of the Service (other than a member to whom subsection (a) applies) who is retired under section 4007(c)(1) or 4008(b) or 4010a of this title shall receive—
((1)) one-twelfth of a year’s salary at his or her then current salary rate for each year of service and proportionately for a fraction of a year, but not exceeding a total of one year’s salary at his or her then current salary rate, payable without interest from the Foreign Service Retirement and Disability Fund in 3 equal installments, such installments to be paid on January 1 of each of the first 3 calendar years beginning after the retirement of the member (except that in special cases, the Secretary of State may accelerate or combine such installments); and
((2))
((A)) for those participants in the Foreign Service Retirement and Disability System, a refund as provided in of the contributions made by the member to the Foreign Service Retirement and Disability Fund, except that in lieu of such refund a member who has at least 5 years of service credit toward retirement under the Foreign Service Retirement and Disability System (excluding military and naval service) may elect to receive an annuity, computed under , commencing at age 60; and (B) for those participants in the Foreign Service Pension System, benefits as provided in .