Formations of the United States Army during the Vietnam War explained

See also: Formations of the United States Army. The following is a list of units of the United States Army during the Vietnam War.

Active Duty Divisions and Brigades in Theater

AirMobile Divisions

• 1st Cavalry Division
• 101st Airborne Division

Infantry Divisions

• 1st Infantry Division
• 4th Infantry Division
• 9th Infantry Division
• 23rd Infantry Division
• 25th Infantry Division

Independent Brigades

• 1st Brigade, 5th Infantry Division
• 1st Aviation Brigade
• 1st Signal Brigade
• 3rd Brigade, 82nd Airborne Division
• 11th Armored Cavalry Regiment
• 11th Infantry Brigade
• 18th Military Police Brigade
• 44th Medical Brigade
• 173rd Airborne Brigade
• 196th Infantry Brigade
• 198th Infantry Brigade
• 199th Infantry Brigade
• 18th Engineer Brigade (combat)
• 20th Engineer Brigade
• 223rd Aviation Brigade

Active Duty Divisions not in Theater

Armored Divisions

• 1st Armored Division
• 2nd Armored Division
• 3rd Armored Division
• 4th Armored Division

Infantry Divisions

• 2nd Infantry Division
• 3rd Infantry Division
• 7th Infantry Division
• 8th Infantry Division
• 24th Infantry Division
• 10th Mountain Division

National Guard Divisions

Armored Divisions

• 30th Armored Division
• 50th Armored Division

Infantry Divisions

• 26th Infantry Division
• 28th Infantry Division
• 30th Infantry Division
• 38th Infantry Division
• 40th Infantry Division
• 42nd Infantry Division
• 47th Infantry Division
• 49th Infantry Division