corps

Corps (; plural corps ; from French corps, from the Latin corpus "body") is a term used for several different kinds of organization. A military innovation by Napoleon I, the formation was first named as such in 1805. The size of a corps varies greatly, but two to five divisions and anywhere from 40,000 to 80,000 are the numbers stated by the US Department of Defense.
Within military terminology a corps may be:

an operational formation, sometimes known as a field corps, which consists of two or more divisions, such as the Corps d'armée, later known as I Corps ("First Corps") of Napoleon I's Grande Armée);
an administrative corps (or mustering) – that is a specialized branch of a military service (such as an artillery corps, an armoured corps, a signal corps, a medical corps, a marine corps, or a corps of military police) or;
in some cases, a distinct service within a national military (such as the United States Marine Corps).These usages often overlap.
Corps may also be a generic term for a non-military organization, such as the US Peace Corps and European Solidarity Corps.

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