Distinctive unit insignia. War Department Circular 161 dated 29 April 1920 authorized the use of a regimental coat of arms or badge as approved by the War Department for wear on the collar of the white uniform and the lapels of the mess jacket. War Department Circular 244, 1921 states: "It has been approved, in principle, that regiments of the Regular Army and National Guard may wear distinctive badges or trimmings on their uniforms as a means of promoting esprit de corps and keeping alive historical traditions. Various organizations which carry colors or standards have generally submitted coats of arms having certain historical significance. As fast as approved these coats of arms will for the basis for regimental colors or standards which will eventually replace the present regimental colors or standards when these wear out. The use of these coats of arms as collar ornaments in lieu of the insignia of corps, departments, or arms of service would be an example of distinctive badge to be worn by the regiment." `The first unit to wear this insignia was the 51st Artillery which received approval for wear on March 18, 1922. It was designed by Master Gunner and Master Sergeant Edward C. Kuhn, the artist responsible for creating all authorized coats of arms and distinctive unit insignia at the time.