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-Haidhausen Au-Haidhausen Au-Haidhausen is the 5th borough of the German city of Munich, Bavaria. It is formed by the Au and Haidhausen districts. Au lies opposite the Altstadt of the city on the easterly plain tract of the Isar. Haidhausen is above Au on the Isar's uplands. Au-Haidhausen borders Bogenhausen to the north, Berg am Laim to the east, Obergiesing to the south, level with the flow of the Isar at Untergiesing, ending in the west at the river. Au and Haidhausen used to be hostel areas for trade workers and day labourers outside of the medieval town walls of Munich.