Separate brigades and cavalry regiments normally have a fixed organization. They are capable of performing any tactical mission and designed to be largely self-sustaining. Divisions are the basic unit of maneuver at the tactical level. Armored, mechanized infantry, light infantry, airborne and air assault divisions are all presently in the force. They possess great flexibility.
Divisions perform major tactical operations for the corps and can conduct sustained battles.
Corps are tailored for the theater and mission for which they are deployed. Corps plan and conduct major operations and battles. They synchronize tactical activities of their divisions. A variety of separate brigades may be assigned to a Corps when required by the mission. The Corps commander may use these elements to weight its main effort and perform special combat functions.