PUBLIC LAWS-CH. 957-AUG. 13,1946 such assignment or until the expiration of two years, whichever is the shorter. Director eneral or (b) A Foreign Service officer may be appointed as Director General eral. or Deputy Director General, notwithstanding the provisions of the last sentence of paragraph (a) of this section, but any such officer may not serve longer than four years in such position or positions and upon the completion of such service may not again be assigned to a position in the Department until the expiration of a period of time equal to his tour of duty as Director General or Deputy Director General or until the expiration of two years, whichever is shorter. mPoition in Depart- (C) If a Foreign Service officer shall be appointed by the President, by and with the advice and consent of the Senate, to a position in the Department, the period of his service in such capacity shall be con- strued as constituting an assignment for duty in the Department within the meaning of paragraph (a) of this section and such person shall not, by virtue of the acceptance of such an assignment, lose his status as a Foreign Service officer. Service in such a position shall not, however, be subject to the limitations concerning the duration of an assignment or concerning reassignment contained in that paragraph. Salary. (d) If the basic minimum salary of the position to which an officer or employee of the Service is assigned pursuant to the terms of this section is higher than the salary such officer or employee is entitled to receive as an officer or employee of the Service, such officer or employee shall, during the period such difference in salary exists, receive the salary of the position in which he is serving in lieu of his salary as an officer or employee of the Service. Any salary paid under the provisions of this section shall be paid from appropriations made available for the payment of salaries of officers and employees of the Service and shall be the salary on the basis of which computations and payments shall be made in accordance with the provisions of title Ptt, p. o101o. VIII COMrPULSORY SERVICE OF FOREIGN SERVICE OFFICERS IN THE CONTINENTAL UNITED STATES SEC. 572. Every Foreign Service officer shall, during his first fifteen years of service in such capacity, be assigned for duty in the continental United States in accordance with the provisions of section 571 for periods totaling not less than three years. ASSIGNMENT FOR CONSULTATION OR INSTRUCTION Governmentagency. SEC. 573. (a) Any officer or employee of the Service may, in the discretion of the Secretary, be assigned or detailed to any Government agency for consultation or specific instruction either at the commence- ment, during the course of, or at the close of the period of his official service; and any such detail or assignment, if not more than four months in duration, shall not be considered as an assignment within the meaning of section 571. etCommercial irms. (b) Any officer or employee of the Service may be assigned or tions; or commercial firms. ASSIGNMENT TO TRADE, LABOR, AGRICULTURAL, SCIENTIFIC, OR OTHER CONFERENCES SEC. 574. An officer or employee of the Service may, in the discretion of the Secretary, be assigned or detailed for duty with domestic or international trade, labor, agricultural, scientific, or other conferences, congresses, or gatherings, including those whose place of meeting is 1012 [60 STAT.