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 country. The Council of Europe recommends that au pairs be issued standard contracts with their family. Some au pairs are now male, but females remain the overwhelming majority. Many governments impose limits as to how many hours an au pair is allowed to work. Tasks can include taking children to and from school, taking children to after-school activities, cooking, cleaning, ironing, tidying up and babysitting. Each placement varies depending on the host family. In many developing countries, an abundant supply of local domestic labour is still available, so there is little or no demand for au pairs. Au pair relationships