Section, act July 1, 1944, ch. 373, title III, § 306, as added Aug. 2, 1956, ch. 871, title I, § 101, 70 Stat. 923; amended July 23, 1959, Pub. L. 86–105, § 1, 73 Stat. 239; Sept. 8, 1960, Pub. L. 88–497, § 2, 78 Stat. 613; Aug. 16, 1968, Pub. L. 90–490, title III, § 302(b), 82 Stat. 789; Mar. 12, 1970, Pub. L. 91–208, § 3, 84 Stat. 52; Oct. 30, 1970, Pub. L. 91–515, title VI, § 601(b)(2), 84 Stat. 1311; June 18, 1973, Pub. L. 93–45, title I, § 104(a), 87 Stat. 91, which related to graduate or specialized training for physicians, engineers, nurses, and other professional personnel, was renumbered section 312 of act July 1, 1944, by Pub. L. 93–353 and transferred to section 244–1 of this title, and was subsequently repealed.