Pub. L. 83-773, tit. VI, sec. 608

Sec. 608. When an officer of the Reserve is promoted to the next higher grade under the provisions of this Act either for temporary service or for service in permanent grade, he shall be assigned the same date of rank as that assigned to his running mate for either and/or both types of service and shall be allowed the pay and allowances of the higher grade for duty performed from the date his running mate became entitled to such pay and allowances.