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This article is missing information about conditions of achieving this rank, promotion requirements, service length, authorities and responsibilities. Please expand the article to include this information. Further details may exist on the talk page. (November 2018)

General officers, Flag officers, Air officers
	Armies, air forces (non-Commonwealth)	Navies, coast guards	Air forces (Commonwealth system)
	Field marshal	Admiral of the fleet	Marshal of the air force
	General or colonel general or army general	Admiral	Air chief marshal
	Lieutenant general or army corps general	Vice admiral	Air marshal
	Major general or divisional general	Rear admiral or Counter admiral	Air vice-marshal
	Brigadier or brigadier general	Commodore or flotilla admiral	Air commodore
Senior officers
	Colonel	(Ship-of-the-line) Captain	Group captain
	Lieutenant colonel	Frigate captain or Commander	Wing commander
	Major or commandant	Corvette captain or Lieutenant commander	Squadron leader
Junior officers
	Captain	Lieutenant	Flight lieutenant
	First lieutenant or lieutenant	Lieutenant junior grade or sub-lieutenant	Flying officer
	Second lieutenant or junior lieutenant	Ensign or midshipman	Pilot officer
Non-commissioned officers
	Warrant officer or sergeant major	Warrant officer or chief petty officer	Warrant officer
	Sergeant	Petty officer	Sergeant
	Corporal or bombardier	Leading seaman	Corporal
Enlisted ranks
	Lance corporal or Lance bombardier or Specialist	Able seaman	Leading aircraftman or Air specialist
	Private or gunner or trooper or sapper	Seaman	Aircraftman or airman or aviator

The army rank of captain (from the French capitaine) is a commissioned officer rank historically corresponding to the command of a company of soldiers. The rank is also used by some air forces and marine forces, but usually refers to a more senior officer.

Captain (armed forces)

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