A corps is a military unit usually made up of two or more divisions.[1] In the United States Army, a corps is the largest tactical unit that can plan and carry out its own missions.[2] The term can also be applied to a military unit with a specific function such as a Quartermaster Corps or an Intelligence Corps.[1] It can be applied to a branch of a military such as the United States Marine Corps.[3] It can also mean a body of officers such as a Cadet Corps. The word has other uses. A group of people engaged in the same work can be called a corps. An example is the Peace Corps. The word comes from the Old French cors meaning "body, person, corpse, life".[4] That word, in turn, is based on the Latin word corpus meaning "body".[4]