Section, acts Aug. 13, 1946, ch. 957, title VIII, 851, 60 Stat. 1023; Sept. 8, 1960, Pub. L. 86–723, § 39, 74 Stat. 844; Feb. 28, 1970, Pub. L. 91–201, title II, § 204, 84 Stat. 19; July 12, 1976, Pub. L. 94–350, title V, § 511, 90 Stat. 842, Ex. Ord. No. 12145, 1111, July 18, 1979, 44 F.R. 42654, related to computation, etc., of creditable service period for annuities.