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This is a list of historical formations of the United States Army. Units still in existence are in bold.

For specific eras:

• Formations of the United States Army during the Mexican Revolution
• Formations of the United States Army during World War I
• Formations of the United States Army during World War II
• Formations of the United States Army during the Vietnam War
• Formations of the United States Army during the War on Terrorism
• List of current formations of the United States Army

Army groups

• 1st Army Group ( World War II " phantom" formation)
• 6th Army Group
• 12th Army Group
• 15th Army Group

Field armies

• First Allied Airborne Army
• First United States Army—U.S. Army Training, Readiness, and Mobilization command formation
• Second United States Army— United States Army Cyber Command
• Third United States Army— United States Army Central command formation
• Fourth United States Army
• Fifth United States Army— United States Army North command formation
• Sixth United States Army— United States Army South command formation
• Seventh United States Army— United States Army Europe command formation
• Eighth United States Army— United States Army Korea command formation
• Ninth United States Army— United States Army Africa command formation
• Tenth United States Army
• Fourteenth United States Army (World War II "phantom" formation)
• Fifteenth United States Army

Army corps

Airborne, armored, and infantry are grouped separately. The numbering system for the airborne corps is a continuation of the infantry numbering system.

Airborne corps

• XVIII Airborne Corps

Armored corps

• I Armored Corps (reflagged as the Seventh Army)
• II Armored Corps (reflagged as XVIII Airborne Corps)
• III Armored Corps (reflagged as XIX Corps)
• IV Armored Corps (reflagged as XX Corps)

Army corps

Army divisions

Air assault divisions

• 11th Air Assault Division (Test) (1963–1965)

Airborne divisions

• 6th Airborne Division (phantom World War II division)
• 9th Airborne Division (phantom World War II division)
• 11th Airborne Division "Angels"
• 13th Airborne Division "Lucky Thirteenth"
• 15th Airborne Division (unorganized World War II division)
• 17th Airborne Division "Golden Talons"
• 18th Airborne Division (phantom World War II division)
• 21st Airborne Division (phantom World War II division)
• 80th Airborne Division (1946–52)
• 82nd Airborne Division "All American"
• 84th Airborne Division (1946–52)
• 100th Airborne Division (1946–52)
• 101st Airborne Division "Screaming Eagles"
• 108th Airborne Division (1946–52), Later Division was Army Reserve Division, serving as in Infantry and later Training missions
• 135th Airborne Division (phantom World War II division)

Armored divisions

• 1st Armored Division "Old Ironsides"
• 2nd Armored Division "Hell On Wheels"
• 3rd Armored Division "Spearhead Division"
• 4th Armored Division "Breakthrough Division"
• 5th Armored Division "Victory"
• 6th Armored Division "Super Sixth", "Bulgebusters"
• 7th Armored Division "Lucky Seventh"
• 8th Armored Division "Showhorse"
• 9th Armored Division "The Phantom Division"
• 10th Armored Division "Tiger Division"
• 11th Armored Division "Thunderbolt Division"
• 12th Armored Division "Hellcat Division"
• 13th Armored Division
• 14th Armored Division
• 15th Armored Division (phantom World War II division)
• 16th Armored Division
• 18th Armored Division (unorganized World War II division)
• 19th Armored Division (unorganized World War II division)
• 20th Armored Division
• 21st Armored Division (unorganized World War II division)
• 22nd Armored Division (unorganized World War II division)
• 25th Armored Division (phantom World War II division)
• 27th Armored Division
• 30th Armored Division
• 39th Armored Division (phantom World War II division) (possible post war Armored Brigade, not division)
• 40th Armored Division
• 48th Armored Division ( Georgia Army National Guard to 1967)
• 49th Armored Division "Lone Star" TX ARNG (1946–68, 1973–2004)
• 50th Armored Division "Jersey Blues" NJ ARNG (up to early 1990s)

Cavalry divisions

• Cavalry Division—authorized as the 4th Regular Army division in 1913; never officially numerically designated.
• 1st Cavalry Division
• 2nd Cavalry Division
• 3rd Cavalry Division
• 15th Cavalry Division
• 21st Cavalry Division
• 22nd Cavalry Division
• 23rd Cavalry Division
• 24th Cavalry Division
• 61st Cavalry Division
• 62nd Cavalry Division
• 63rd Cavalry Division
• 64th Cavalry Division
• 65th Cavalry Division
• 66th Cavalry Division

Infantry divisions

• 1st Infantry Division "The Big Red One"
• 2nd Infantry Division "Indian Head Division"
• 3rd Infantry Division "Rock of the Marne"
• 4th Infantry Division "Ivy Division", "Iron Horse"
• 5th Infantry Division "Red Diamond"
• 6th Infantry Division "Red Star"
• 7th Infantry Division "Bayonet Division"
• 8th Infantry Division "Pathfinders", "Golden Arrow"
• 9th Infantry Division "Octfoil", "Old Reliables"
• 10th Division (World War I)
• 10th Mountain Infantry Division (1943–1957)
• 11th Division (World War I)
• 12th Division (World War I)
• 12th Infantry Division "Philippine division"
• 13th Division "Lucky 13 Division" (World War I)
• 14th Division (World War I)
• 14th Infantry Division (phantom World War II division)
• 15th Division (World War I)
• 16th Division (World War I)
• 17th Division (World War I)
• 18th Division (World War I)
• 19th Division "Moon & Star"
• 19th Infantry Division (phantom World War II division)
• 20th Division (World War I)
• 22nd Infantry Division (phantom World War II division)
• 23rd Infantry Division "Americal Division"
• 24th Infantry Division "Victory Division"
• 25th Infantry Division "Tropic Lightning"
• 26th Infantry Division "Yankee Division"
• 27th Infantry Division "New York Division"
• 28th Infantry Division "Keystone Division"
• 29th Infantry Division "The Blue and Gray"
• 30th Infantry Division "Old Hickory"
• 31st Infantry Division "Dixie Division"
• 32nd Infantry Division "Red Arrow"
• 33rd Infantry Division "Prairie Division"
• 34th Infantry Division "Red Bull Division"
• 35th Infantry Division "Santa Fe Division"
• 36th Infantry Division "Texas Division"
• 37th Infantry Division "Buckeye Division"
• 38th Infantry Division "Cyclone Division"
• 39th Infantry Division "Delta Division"
• 40th Infantry Division "Sunburst Division"
• 41st Infantry Division "Sunset Division"
• 42nd Infantry Division "Rainbow Division"
• 43rd Infantry Division "Red Wing Division"
• 44th Infantry Division
• 45th Infantry Division "Thunderbird Division"
• 46th Infantry Division (United States) (phantom World War II division, postwar National Guard formation)
• 47th Infantry Division (Post-war National Guard Division nicknamed "Viking")
• 48th Infantry Division (United States) (phantom World War II division, postwar National Guard formation)
• 49th Infantry Division (Post-war National Guard Division nicknamed "49'ers")
• 50th Infantry Division (phantom World War II division)
• 51st Infantry Division (Post-war National Guard Division)
• 52nd Infantry Division
• 55th Infantry Division (phantom World War II division)
• 59th Infantry Division (phantom World War II division)
• 61st Infantry Division (see Divisions of the United States Army, unorganized World War II division)
• 62nd Infantry Division (see Divisions of the United States Army, unorganized World War II division)
• 63rd Infantry Division
• 65th Infantry Division
• 66th Infantry Division
• an infantry division with the number 67 was never organized during World War II (see Divisions of the United States Army)
• 68th Infantry Division - never organized during World War II (see Divisions of the United States Army)
• 69th Infantry Division
• 70th Infantry Division "Trailblazers"
• 71st Infantry Division "Red Circle"
• an infantry division with the number 72 was never organized during World War II (see Divisions of the United States Army)
• an infantry division with the number 73 was never organized during World War II (see Divisions of the United States Army)
• an infantry division with the number 74 was never organized during World War II (see Divisions of the United States Army)
• 75th Infantry Division
• 76th Infantry Division "Liberty Bell Division"
• 77th Infantry Division "Metropolitan Division" also "Statue of Liberty Division"
• 78th Infantry Division "Lightning Division"
• 79th Infantry Division "Liberty Division"
• 80th Infantry Division "Blue Ridge Division"
• 81st Infantry Division "Wildcat Division"
• 82nd Infantry Division "All American Division" (Later Airborne Division with same number)
• 83rd Infantry Division "Thunderbolt Division"
• 84th Infantry Division "Railsplitters"
• 85th Infantry Division "Custer Division"
• 86th Infantry Division "Blackhawk Division"
• 87th Infantry Division "Golden Acorn"
• 88th Infantry Division "Blue Devils"
• 89th Infantry Division "Rolling W Division"
• 90th Infantry Division "Tough Ombres"
• 91st Infantry Division "Wild West"
• 92nd Infantry Division "Buffalo Division"
• 93rd Infantry Division "Blue Helmets"
• 94th Infantry Division "Neuf-Cats"
• 95th Infantry Division "Ironman Division" (Also "Victory Division", and "Iron Men of Metz Division")
• 96th Infantry Division "Deadeye Division"
• 97th Infantry Division "Trident Division"
• 98th Infantry Division "Iroquois"
• 99th Infantry Division "Checkerboard Division"
• 100th Infantry Division "Century"
• 101st Division (Later Airborne Division with same number)
• 102nd Infantry Division "Ozark Division"
• 103rd Infantry Division "Cactus Division"
• 104th Infantry Division "Timberwolf"
• intended as a Black formation, an infantry division with the number 105 was never organized during World War II ^[1]
• 106th Infantry Division "Golden Lion Division"
• an infantry division with the number 107 was never organized during World War II ^[2]
• 108th Infantry Division {phantom World War II Division}
• 108th Infantry Division "Golden Griffons" (Formerly Airborne Division of same number)
• 109th Infantry Division (phantom World War II division)
• 112th Infantry Division (phantom World War II division)
• 119th Infantry Division (phantom World War II division)
• 125th Infantry Division (phantom World War II division)
• 130th Infantry Division (phantom World War II division)
• 141st Infantry Division (phantom World War II division)
• 157th Infantry Division (phantom World War II division)
• Americal Division (see 23rd Infantry Division)
• Hawaiian Division (see also: 24th Infantry Division; 25th Infantry Division)
• Maneuver Division (1911)
• Panama Canal Division (inactivated 1932)
• Philippine Division (see 12th Infantry Division)

Light divisions

• 10th Light Division (Alpine)
• 71st Light Division (Truck)
• 89th Light Division (Pack)

Mountain divisions

• 10th Mountain Division

Reserve training divisions

• 75th Division
• 78th Division "Lightning Division"
• 80th Division "Blue Ridge Division"
• 84th Division "Lincoln County Division"
• 85th Division "Custer Division"
• 87th Division "Golden Acorn Division"
• 91st Division "Wild West Division"
• 95th Division "Victory Division"
• 98th Division "Iroquois Division"
• 100th Division "Century Division"
• 104th Division "Timberwolf Division"
• 108th Division "Golden Griffons"

References

Further reading

• Wilson, John B. (1998). Maneuver and Firepower: The Evolution of Divisions and Separate Brigades (PDF). Washington, D.C.: Center for Military History, U.S. Army. ISBN  0-16-049571-7. Retrieved April 5, 2015.