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 pair hours of academic credit or its equivalent during their program year. The host family is required to provide (up to) the first $1,000 toward the cost of the au pair's required academic course work. The Extension Program When the Au Pair Program started in the United States in 1989, au pairs were only allowed to stay in the country and work as au pairs for a 12-month period. In 2006, the U.S. Department of State allowed au pairs to legally extend their stay and work for 6, 9, or 12 additional months. The program’s regulations state that the Department of