This table will help determine your character's superiors and his or her next step in the command chain. Going across are equivalent ranks across U.S. and British forces. The top most rank is the most superior down to the bottom and least superior.
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USA | USAF | USMC
General
Lieutenant General
Major General
Brigadier General
Colonel
Lieutenant Colonel
Major
Captain
1st Lieutenant
2nd Lieutenant
British Army | Royal Marines
General
Lieutenant General
Major General
Brigadier
Colonel
Lieutenant Colonel
Major
Captain
Lieutenant
2nd Lieutenant
Royal Air Force
Air Chief Marshall
Air Marshall
Air Vice Marshall
Air Commodore
Group Captain
Wing Commander
Squadron Leader
Flight Lieutenant
Flying Officer
Pilot Officer
United States Navy
Admiral
Vice Admiral
Rear Admiral (Upper)
Rear Admiral (Lower)
Captain
Commander
Lieutenant Commander
Lieutenant
Lieutenant Junior Grade
Ensign
Royal Navy
Admiral
Vice Admiral
Rear Admiral
Commodore
Captain
Commander
Lieutenant Commander
Lieutenant
Sub-Lieutenant
Midshipman
Civilians
S-10
S-9
S-8
S-7
S-6
S-5
S-4
S-3
S-2
S-1