The management of the Corporation shall be vested in a board of directors (hereinafter referred to as the “Board”), subject to the general supervision and direction of the Secretary. The Secretary shall be an ex officio director and shall serve as Chairman of the Board. The Board shall consist of seven members (in addition to the Secretary), who shall be appointed by the President. In addition to their duties as members of the Board, such appointed members shall perform such other duties as may be prescribed by the Secretary. Each appointed member of the Board shall receive compensation at such rate not in excess of the maximum then payable under chapter 51 and subchapter III of chapter 53 of title 5 as may be fixed by the Secretary, except that any such member who holds another office or position under the Federal Government the compensation for which exceeds such rate may elect to receive compensation at the rate provided for such other office or position in lieu of the compensation provided by this section. A majority of the directors shall constitute a quorum of the Board and action shall be taken only by a majority vote of those present.