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 pair wages exceed the applicable dollar threshold, then the host family must withhold social security and Medicare taxes and report them on Schedule H of Form 1040 and on Form W-2. The host family must apply for an Employer Identification Number (EIN) if it is required to withhold tax and file Form W-2. Potential au pairs must: Au pairs in the United States are categorized by program types. Most au pair organizations in the United States classify au pairs by the following programs: Standard Au Pair Program The Standard Au Pair program is the most popular program available. Standard au