for quarters allowances and cost-of-living allowances, in accordance with 5 U.S.C. 5922–5924 . 704. Unless otherwise specified in law during the current fiscal year, no part of any appropriation contained in this or any other Act shall be used to pay the compensation of any officer or employee of the Government of the United States (including any agency the majority of the stock of which is owned by the Government of the United States) whose post of duty is in the continental United States unless such person: (1) is a citizen of the United States