Text this: National Security Act of 1947 (P.L. 253, 80th Congress, July 26, 1947) (61 Stat. 495). as Amended to Aug. 1953 and Including the National Security Act Amendments of 1949, P.L. 216, 81st Congress, Aug. 10, 1949 (63 Stat. 578), P.L. 416, 82d Congress, June 28, 1952, Reorganization Plan 3 of 1953, Reorganization Plan 6 of 1953.