Mutual mortgage insurance, servicemen's mortgage insurance, administrative rules and regulations under sec. 203 and 222 of National housing act, as amended, title 24, chap. 2, subchap. C, pts. 221, 222, 225, and 226, Code of Federal regulations, 1949, effective dates, sec. 203, Aug. 9, 1954, sec. 222, Nov. 5, 1954.