Armed Forces under the command or operational control of a foreign national, unless the President's military advisors have submitted to the President a recommendation that such involvement is in the national interest of the United States and the President has submitted to Congress such a recommendation: Provided further , That any payment of arrearages with funds appropriated by this Act shall be subject to the regular notification procedures of the Committees on Appropriations. International Commissions For necessary expenses, not otherwise provided for, to meet obligations of the United States arising under treaties, or specific Acts of Congress, as follows: International boundary and water commission, united states and mexico For necessary expenses for the United States Section of the International Boundary and Water Commission, United States and Mexico, and to comply with laws applicable to the United States Section, including up to $6,000 for representation expenses