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
United States Army officer rank insignia had silver eagles on gold epaulettes. No insignia existed yet for lieutenant colonels, majors, captains, and lieutenants—the length and size of the fringe showing the difference of grade. In 1836, shoulder straps were adopted to replace the epaulette for field duty. The straps followed the same color combination as the epaulettes; that is, the border was gold with silver insignia for all officers except those of infantry which had silver border with gold insignia. At that time, lieutenant colonels and majors were authorized leaves, captains were authorized two bars, and first lieutenants were authorized one bar on the shoulder straps.