Ranks and insignia of NATO are combined military insignia used by the member countries of the North Atlantic Treaty Organization.
The rank scale is used for specifying posts within NATO.
NATO maintains a "standard rank scale" in an attempt to match every member country's military rank to corresponding ranks used by the other members. The rank categories were established in a 1978 document entitled STANAG 2116 (formally titled NATO Codes for Grades of Military Personnel).
OR1–OR9 (bottom to top) are used for other ranks:
The numbers in the system broadly correspond to the U.S. uniformed services pay grades, with OR-x replacing E-x. The main difference is in the commissioned officer ranks, where the US system recognises two ranks at OF-1 level (O-1 and O-2), meaning that all O-x numbers after O-1 are one point higher on the US scale than they are on the NATO scale (e.g. a major is OF-3 on the NATO scale and O-4 on the US scale).
|Rank group||General/flag officers||Field/senior officers||Junior officers||Officer cadet|
|NATO code||OF-10||OF-9||OF-8||OF-7||OF-6||OF-5||OF-4||OF-3||OF-2||OF-1||OF(D)||Student officer|
|Uniformed services pay grade||Special grade||O-10||O-9||O-8||O-7||O-6||O-5||O-4||O-3||O-2||O-1||Officer candidate|
|Rank group||Non-commissioned officers||Enlisted|
|Uniformed services pay grade||Special||E-9||E-8||E-7||E-6||E-5||E-4||E-3||E-2||E-1|