Section 746, act June 29, 1949, ch. 277, 1, 63 Stat. 299, related to compensation and pay of civilians keepers of lighthouses and civilian employees on Coast Guard vessels. Section 746a, act June 29, 1949, ch. 277, 2, 63 Stat. 299, related to extra pay and hours of duty. Section 746b, act June 29, 1949, ch. 277, 3, 63 Stat. 300, related to additional compensation as affecting retirement compensation.