Infantry

On January 1, 1939 the U.S. Army adopted a "triangular" structure for its infantry divisions. This new structure reduced a division from the old "square" structure of two brigades with two regiments each, to three regiments each without the brigade level of organization. The triangular structure was carried down to the squad level. The overall structure of a division was:

• 1 Division Headquarters (38 officers, 8 warrant officers, 103 enlisted)
• 1 Headquarters Company (4 officers, 106 enlisted)
• 1 Reconnaissance Troop (6 officers, 149 enlisted)
• 3 Infantry Regiments (453 officers, 15 warrant officers, 9300 enlisted)
  • 3 Infantry Battalions per regiment
• Division Artillery
  • 1 Headquarters and Headquarters Battery (14 officers, 1 warrant officer, 105 enlisted)
  • 3 (105mm) Field Artillery Battalions (93 officers, 6 warrant officers, 1467 enlisted)
  • 1 (155 mm) Field Artillery Battalion (29 officers, 2 warrant officers, 500 enlisted)
• 1 Engineer Combat Battalion (29 officers, 3 warrant officers, 632 enlisted)
• Special Troops
  • 1 Signal Company (7 officers, 4 warrant officers, 215 enlisted)
  • 1 Ordnance Company (9 officers, 1 warrant officer, 137 enlisted)
  • 1 Quartermaster Company (10 officers, 183 enlisted)
  • 1 Military Police Platoon (3 officers, 70 enlisted)
  • 1 Division Band (2 warrant officers, 56 enlisted)
• Medical Battalion (35 officers, 2 warrant officers, 429 enlisted)

Airborne

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Rangers

Rangers in World War II were not organized by divisions. The largest permanent organizational unit used by Rangers was the battalion. The 1st, 2nd and 3rd Battalions were temporarily organized as the 6615th Ranger Force.

Unit Hierarchy

• Division
• Regiment
• Battalion
• Company
• Platoon
• Squad

Books at Amazon.com

• U.S. Army Infantry Divisions 1942-1943
• U.S. Army Infantry Divisions: Volume 1: Organization, Doctrine and Equipment
• U.S. Army Infantry Divisions: Volume 2: Orders of Battle and Combat Chronologies

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