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General officers, Flag officers, Air officers
	Armies, air forces (non-Commonwealth)	Navies, coast guards	Air forces (Commonwealth system)
	Marshal or 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	Commander or frigate captain	Wing commander
	Major or commandant	Lieutenant commander or corvette captain	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

Second lieutenant is a junior commissioned officer military rank in many armed forces.^[1] The lowest officer rank, it is usually placed below lieutenant or first lieutenant.