The Division performs major tactical operations and can conduct sustained battles and engagements. Divisions are numbered (e.g., 1st Armored Division, 82d Airborne Division) and are categorized by one of five types: Light Infantry, Mechanized Infantry, Armor, Airborne or Air Assault.

The Division is commanded by a Major General (0-8) who is assisted by two principal Brigadier Generals ((0-7) who perform duties as Assistant Division Commanders (ADC) - one for Maneuver (ADC-M) and one for Support (ADC-S). The Command Sergeant Major is the principal non-commissioned officer assistant.

Major General O-8
Brigadier General O-7
Command Sergeant Major CSM E-9

Divisions are composed of three (3) tactical maneuver (Infantry and/or Armor) Brigades and a Division base of combat support and combat service support elements. There are currently ten (10) Divisions in the Active Army and eight (8) Divisions in the Reserves/National Guard.