The Secretary shall establish compensation (including position classification) plans for foreign national employees of the Service and United States citizens employed under section 3951(c)(1) of this title
. To the extent consistent with the public interest, each compensation plan shall be based upon prevailing wage rates and compensation practices (including participation in local social security plans) for corresponding types of positions in the locality of employment, except that such compensation plans shall provide for payment of wages to United States citizens at a rate which is no less than the then applicable minimum wage rate specified in section 206(a)(1) of title 29
. Any compensation plan established under this section may include provision for (A) leaves of absence with pay for employees in accordance with prevailing law and employment practices in the locality of employment without regard to any limitation contained in section 6310 of title 5
, (B) programs for voluntary transfers of such leave and voluntary leave banks, which shall, to the extent practicable, be established in a manner consistent with the provisions of subchapters III and IV, respectively, of chapter 63 of title 5, and (C) payments by the Government and employees to (i) a trust or other fund in a financial institution in order to finance future benefits for employees, including provision for retention in the fund of accumulated interest and dividends for the benefit of covered employees; or (ii) a Foreign Service National Savings Fund established in the Treasury of the United States, which (I) shall be administered by the Secretary, at whose direction the Secretary of the Treasury shall invest amounts not required for the current needs of the Fund; and (II) shall be public monies, which are authorized to be appropriated and remain available without fiscal year limitation to pay benefits, to be invested in public debt obligations bearing interest at rates determined by the Secretary of the Treasury taking into consideration current average market yields on outstanding marketable obligations of the United States of comparable maturity, and to pay administrative expenses. For United States citizens under a compensation plan, the Secretary shall define those allowances and benefits provided under United States law which shall be included as part of the total compensation package, notwithstanding any other provision of law, except that this section shall not be used to override United States minimum wage requirements, or any provision of the Social Security Act [42 U.S.C. 301
et seq.] or title 26.