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
Air force officer rank insignia military. While countries outside the NATO command structure (including some NATO member countries such as France) do not strictly fall into this classification structure and there may be instances of overlap the codes still provide a useful gauge in determining what ranks are broadly equivalent. Note that the NATO officer rank codes (OF-1 to OF-10) are differently numbered from the US officer rank codes (O-1 to O-11). Air force officer rank insignia To assist in the comparison of different countries' air force officer rank insignia, NATO rank codes have been used. These are established codes for determining the seniority of