Entitlement to Benefits for Services Performed Outside United States; Service Exceeding Thirty MonthsPersons appointed, employed, or assigned after May 19, 1959, under former
section 1787(c) of this title or
section 2385(d) of this title for the purpose of performing functions under the Mutual Security Act of 1954 (see
note set out under
section 1754 of this title) and the Foreign Assistance Act of 1961 (
section 2151 et seq. of this title) outside the United States shall not, unless otherwise agreed by the agency in which such benefits may be exercised, be entitled to the benefits provided for by this section in cases in which their service under the appointment, employment, or assignment exceeds thirty months. See Ex. Ord. No. 12163, § 1–602(b), Sept. 29, 1979, 44 F.R. 56677, as amended, set out as a note under
section 2381 of this title.