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Flag commissioned officers
	Armies, air forces (non-Commonwealth)	Navies, coast guard	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 commissioned 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 commissioned 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
	Officer cadet	Officer cadet	Flight cadet
Non-commissioned officers
	Warrant officer or sergeant major	Warrant officer or chief petty officer	Warrant officer
	Sergeant	Petty officer	Sergeant
Enlisted ranks
	Corporal or bombardier	Leading seaman	Corporal
	Lance corporal or Lance bombardier or Specialist	Able seaman	Leading aircraftman
	Private or gunner or trooper or sapper	Seaman	Aircraftman or airman or aviator

Second sergeant is typically a non-commissioned officer rank, used in many countries.

Singapore

Second Sergeant is a specialist rank in the Singapore Armed Forces. Second sergeants are rank above third sergeants, but below first sergeants. The rank insignia for a second sergeant features the three chevrons pointing down shared by all specialists, and one chevron pointing up.^[1]

In combat units, second sergeants usually hold the appointment of platoon sergeant. They are often given instructional billets as well. Third sergeants may be promoted to the rank of 'local second sergeant', holding this local rank only for the conscript period of their active national service, i.e. more responsibilities but without any extra NS allowance compensation. After ORD, the local promotion will not carry over to conscripts' reservist cycle.