Division (military)
A division is a large military unit or formation, usually consisting of between 10,000 and 20,000 soldiers. In most armies, a division is composed of several regiments or brigades; in turn, several divisions typically make up a corps. In most modern militaries, a division tends to be the smallest combined arms unit capable of independent operations; this is due to its self-sustaining role as a unit with a range of combat troops and suitable combat support forces, which can be arranged into various organic combinations.
While the focus of this article is on army divisions, in naval usage division has a completely different meaning, referring either to an administrative/functional sub-unit of a department (e.g., fire control division of the weapons department) aboard naval and coast guard ships, shore commands, and in naval aviation units (including navy, marine corps, and coast guard aviation), to a sub-unit of several ships within a flotilla or squadron, or to two or three sections of aircraft operating under a designated division leader.