(As amended Dec. 27, 1946, eff. Mar. 19, 1948; Dec. 29, 1948, eff. Oct. 20, 1949; Feb. 28, 1966, eff. July 1, 1966; Mar. 2, 1987, eff. Aug. 1, 1987; Apr. 25, 1988, eff. Aug. 1, 1988; Pub. L. 100–690, title VII, § 7049, Nov. 18, 1988, 102 Stat. 4401; Apr. 30, 2007, eff. Dec. 1, 2007.)