Junior officer

Lowest operational commissioned officer

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

Junior officer, company officer or company grade officer refers to the lowest operational commissioned officer category of ranks in a military or paramilitary organization, ranking above non-commissioned officers and below senior officers.

The terms company officer or company-grade officer are used more in the Army, Air Force, or Marine Corps as the ranks of captain, lieutenant grades and other subaltern ranks originated from the officers in command of a company or equivalent (cavalry squadron/troop and artillery battery).^[1]^{[unreliable source?]}

In many armed forces, a junior officer is specifically a commissioned officer holding rank equivalent to a naval lieutenant, an army captain or a flight lieutenant or below.^{[citation needed]}

In the United States Armed Forces, the term junior officer is used by the Navy, Coast Guard, Public Health Service, and NOAA Corps for officers in the ranks of chief warrant officer (W-2 to W-4), ensign (O-1), lieutenant (junior grade) (O-2), lieutenant (O-3), and lieutenant commander (O-4).^{[citation needed]}

References

^ Dorosh, Michael A. "Rank and Responsibility". canadiansoldiers.com: The Canadian soldier in the 20th Century. Self-published by author. Retrieved 31 January 2013.