The rank of vice marshal ("chasu") is unique to the North Korean ranking system. Vice marshal was first conferred in February 1953 on Choe Yong-gon. Sources suggest that the shoulder board rank insignia for marshal and vice marshal then became a single large star without the state coat-of-arms (for marshals) and the state coat-of-arms without a star (for vice marshals). By the time the next conferral of rank to vice marshal was awarded (1985), the shoulder board rank insignia for marshal and vice marshal had taken on their current design.