Chemical Corps affiliation with the corps. The Chemical Corps branch insignia consists of a cobalt blue, enamel benzene ring superimposed over two crossed gold retorts. The branch insignia, which was adopted in 1918 by the fledgling Chemical Service, measures .5 inches in height by 1.81 inches in width. Crossed shells with a dragon head was also commonly used in France for the Chemical service. The Chemical Warfare Service approved the insignia in 1921 and in 1924 the ring adopted the cobalt blue enamel. When the Chemical Warfare Service changed designations to the Chemical Corps in 1946 the symbol was retained. The regimental
Au Sable, Michigan Au Sable, Michigan Au Sable is an unincorporated community in Au Sable Township of Iosco County in the U.S. state of Michigan. It is situated on the southern side of Au Sable River where it enters Lake Huron. The community of Oscoda is on the other side of the river. Au Sable is a census-designated place (CDP) for statistical purposes and has no legal status as an incorporated municipality. As of the 2010 census, the Au Sable CDP population was 1,404, down from 1,533 at the 2000 census. Au Sable was platted in 1849. The post office first opened with