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, §1–111, July 18, 1979, 44 F.R. 42654, related to computation, etc., of creditable service period for annuities.