22 U.S.C. § 4071i

The Secretary of State shall issue regulations providing for the transition from the Foreign Service Retirement and Disability System to the Foreign Service Pension System in a manner comparable to the transition of employees subject to subchapter III of chapter 83 of title 5 (the Civil Service Retirement System) to the Federal Employees’ Retirement System. For this and related purposes, references made to participation in subchapter III of chapter 83 of title 5 (the Civil Service Retirement System), the Social Security Act [42 U.S.C. 301 et seq.], and title 26 shall be deemed to refer to participation in the Foreign Service Pension System or the Foreign Service Retirement and Disability System, as appropriate.