(July 1, 1944, ch. 373, title VI, § 641, formerly § 621, as added Pub. L. 88–443, § 3(a), Aug. 18, 1964, 78 Stat. 458, renumbered § 641, Pub. L. 91–296, title II, § 201, June 30, 1970, 84 Stat. 344; amended Pub. L. 91–515, title VI, § 601(b)(2), Oct. 30, 1970, 84 Stat. 1311; Pub. L. 96–88, title V, § 509(b), Oct. 17, 1979, 93 Stat. 695; Pub. L. 111–256, § 2(f)(4), Oct. 5, 2010, 124 Stat. 2644.)