Clearance.—

Sec. 531. Security Clearance.— No citizen or resident of the United States may be employed, or if already employed, may be assigned to duties by the Director under this Act for a period to exceed three months unless— (a) such individual has been investigated as to loyalty and security by the Civil Service Commission, or by the Federal Bureau of Investigation in the case of specific positions which have been certified by the Director as being of a high degree of importance or sensitivity or in case the Civil Service Commission investigation develops data reflecting that the individual is of questionable loyalty, and a report thereon has been made to the Director, and until the Director has certified in writing (and filed copies thereof with the Senate Committee on Foreign Relations and the House Committee on Foreign Affairs) that, after full consideration of such report, he believes such individual is loyal to the United States, its Constitution, and form of government, and is not now and has never knowingly been a member of any organization advocating contrary views; or (b) such individual has been investigated by a military intelligence agency and the Secretary of Defense has certified in writing that he believes such individual is loyal to the United States and filed copies thereof with the Senate Committee on Foreign Relations and the House Committee on Foreign Affairs. This section shall not apply in the case of any officer appointed by the President by and with the advice and consent of the Senate, nor shall it apply in the case of any person already employed under programs covered by this Act who has been previously investigated in connection with such employment.