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Corps (military)

Military organization
Latvian platoon at Camp Lejune.jpg
Typical units Typical numbers Typical commander
fireteam 3–4 corporal
squad/
section
8–12 sergeant
platoon 15–30 lieutenant
company 80–150 captain/major
battalion/
cohort
300–800 lieutenant colonel
regiment/
brigade
2,000–4,000 colonel/
brigadier general
division/
legion
10,000–15,000 major general
corps 20,000–40,000 lieutenant general
field army 80,000+ general
army group 2+ field armies field marshal/
five-star general
region/
theater
4+ army groups Six-star rank/Head of state
Navies Armies Air forces
Commissioned and Non-commissioned officers
Admiral of
the fleet
Marshal or
Field marshal
Marshal of
the air force
Admiral General Air chief marshal
Vice admiral Lieutenant general Air marshal
Rear admiral Major general Air vice-marshal
Commodore Brigadier or
Brigadier general
Air commodore
Captain Colonel Group captain
Commander Lieutenant colonel Wing commander
Lieutenant
commander
Major or
Commandant
Squadron leader
Lieutenant Captain Flight lieutenant
Sub-lieutenant Lieutenant or
First lieutenant
Flying officer
Ensign Second lieutenant Pilot officer
Midshipman Officer cadet Flight cadet
Enlisted grades
Warrant officer or
Chief petty officer
Warrant officer or
Sergeant major
Warrant officer
Petty officer Sergeant Sergeant
Leading seaman Corporal Corporal
Seaman Private Aircraftman

A corps (/ˈkɔər/; plural corps /ˈkɔərz/; via French, from the Latin corpus "body") is a military unit usually consisting of several divisions.

Some military service branches are also called corps, such as the Military Police Corps, Royal Logistic Corps, Quartermaster Corps, or Medical Corps.

A few civilian organizations use the name corps to imply a similar service level, such as the Peace Corps.

In many armies, a corps is a battlefield formation composed of two or more divisions, and typically commanded by a lieutenant general. During World War I and World War II, due to the large scale of combat, multiple corps were combined into armies which then formed into army groups. In Western armies with numbered corps, the number is often indicated in Roman numerals (e.g., VII Corps).

In the later stages of World War I, the five infantry divisions of the First Australian Imperial Force (AIF)—consisting entirely of personnel who had volunteered for service overseas—were united as the Australian Corps, on the Western Front, under Lieutenant General Sir John Monash.


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