A military unit is a group of personnel organized for a specific purpose. A CADRE is a small group of trained personnel who form the nucleus of an organization. A SQUAD is a small military unit composed of two to twelve soldiers. An ARMY is a large military unit consisting of several corps and divisions. A PLATOON is a military unit typically composed of two to four squads or sections. A LEGION is a large military unit usually consisting of several thousand soldiers. A TROOP is a military unit, originally of cavalry, typically consisting of 60 to 200 soldiers. A DETACHMENT is a small group of personnel detached from a larger unit for a special assignment. An ECHELON is a level or rank in an organization or system. A BRIGADE is a military unit typically consisting of three to six battalions. A REGIMENT is a military unit consisting of several battalions. A BATTALION is a military unit typically consisting of 300 to 800 soldiers.