The WAC had its own branch insignia (the Bust of Pallas Athena), worn by "Branch Immaterial" personnel (those unassigned to a Branch of Service). US Army policy decreed that technical and professional WAC personnel should wear their assigned Branch of Service insignia to reduce confusion. During the existence of the WAC (1943 to 1978) women were prohibited from being assigned to the combat arms branches of the Army – such as the Infantry, Cavalry, Armor, Tank Destroyers, or Artillery and could not serve in a combat area. However, they did serve as valuable staff in their headquarters and staff units stateside or in England.