Royal Navy officer rank insignia the Corps also had the unique ranks of colonel second commandant and colonel commandant. Rank insignia are on brown or dark blue shoulder boards in all dresses save for the combat and barracks duty dress uniforms. From 1911 to 1957 the officer corps even included warrant officers and commissioned warrant officers in the same way as the RN. Although the Royal Marines does not officially use the rank of field marshal, the Captain General Royal Marines, the ceremonial head of the corps, wears a field marshal's rank insignia. Royal Navy officer rank insignia Uniforms for naval officers were not authorised
Uniform of the Union Army as follows: Contemporary photographs and a Winslow Homer painting, "Playing Old Soldier", show staff officers occasionally added their departmental initials within the shoulder straps between the rank insignia. "M.S." for "Medical Staff" appears to have been the most common. With the exception of slight changes to the representing insignia for the more junior commissioned grades as well as additional color combinations for new career fields, the shoulder strap insignia and color scheme survives largely unchanged in the modern era on the Army Service Uniform. Individual officers would sometimes add gold braid Austrian knots on their sleeves but this practice was