# List of formations of the United States Army during World War I

This is a list of formations in the United States Army during World War I. Many of these formations still exist today, though many by different designations.

## Field Armies

Field Armies :
| Name | Activated | Commanding General | Campaigns |
| First Army | August 10, 1918 | Gen. John J. Pershing Lt. Gen. Hunter Liggett | Meuse-Argonne |
| Second Army | October 10, 1918 | Lt. Gen. Robert L. Bullard | Meuse-Argonne |
| Third Army | November 15, 1918 | Maj. Gen. Joseph T. Dickman Lt. Gen. Hunter Liggett | None |

## Corps

Corps :
| Name | Activated | Commanding General | Campaigns |
| I Corps | January 20, 1918 | Maj. Gen. Hunter Liggett Maj. Gen. Joseph T. Dickman Maj. Gen. William M. Wright | - |
| II Corps | February 24, 1918 | Col. George S. Simonds (acting) Maj. Gen. George W. Read | - |
| III Corps | May 16, 1918 | Col. Alfred W. Bjornstad (acting) Maj. Gen. William M. Wright Maj. Gen. Robert Lee Bullard Maj. Gen. John L. Hines | - |
| IV Corps | June 20, 1918 | Col. Stuart Heintzelman (acting) Maj. Gen. Joseph T. Dickman Maj. Gen. Charles H. Muir Maj. Gen. Charles P. Summerall | - |
| V Corps | July 12, 1918 | Maj. Gen. William M. Wright Maj. Gen. George H. Cameron Maj. Gen. Charles P. Summerall | - |
| VI Corps | August 1, 1918 | Maj. Gen. Omar Bundy Brig. Gen. Briant H. Wells (acting) Maj. Gen. Charles C. Ballou Maj. Gen. Charles T. Menoher Maj. Gen. Adelbert Cronkhite | - |
| VII Corps | August 19, 1918 | Maj. Gen. William M. Wright Lt. Col. Gordon Johnston (acting) Maj. Gen. Omar Bundy Col. Herbert J. Brees (acting) Maj. Gen. William G. Haan Maj. Gen. Henry T. Allen | - |
| VIII Corps | November 26, 1918 | Maj. Gen. Henry T. Allen Maj. Gen. Walter H. Gordon | None |
| IX Corps | November 26, 1918 | Maj. Gen. Adelbert Cronkhite Maj. Gen. Charles P. Summerall Maj. Gen. Henry T. Allen | None |

## Divisions
### Cavalry divisions

Cavalry Divisions :
| Shoulder Sleeve Insignia | Name | Activated | Entered Combat | Commanding General | Campaigns |
| None | 15th Cavalry Division | November 27, 1917 | None | Maj. Gen. George W. Read Brig. Gen. DeRosey C. Cabell | - |

### Infantry divisions
#### Regular Army

Infantry Divisions :
| Shoulder Sleeve Insignia | Name | Activated | Entered Combat | Commanding General | Campaigns |
| | 1st Division ("The Big Red One") | 24 May 1917 | 28 May 1918 | Maj. Gen. William L. Sibert Maj. Gen. Robert L. Bullard Maj. Gen. Charles P. Summerall Brig. Gen. Frank Parker | Cantigny Aisne-Marne Saint-Mihiel Meuse–Argonne |
| | 2nd Division ("Indian Head Division") | 26 October 1917 | 1 June 1918 | Brig. Gen. Charles A. Doyen Maj. Gen. Omar Bundy Maj. Gen. James Harbord Maj. Gen. John A. Lejeune | Third Aisne Belleau Wood Aisne-Marne Saint-Mihiel Meuse–Argonne |
| | 3rd Division ("Rock of the Marne") | 21 November 1917 | 4 June 1918 | Maj. Gen. Joseph T. Dickman Maj. Gen. Beaumont B. Buck Brig. Gen. Preston Brown Maj. Gen. Robert Lee Howze | Champagne-Marne Aisne-Marne Saint-Mihiel Meuse–Argonne |
| | 4th Division ("Ivy Division") | 10 December 1917 | 1 July 1918 | Maj. Gen. George H. Cameron Maj. Gen. John L. Hines Maj. Gen. Mark L. Hersey | Aisne-Marne Saint-Mihiel Meuse–Argonne |
| | 5th Division ("Red Diamond") | 11 December 1917 | 14 June 1918 | Maj. Gen. Charles H. Muir Maj. Gen. John E. McMahon Maj. Gen. Hanson E. Ely | Saint-Mihiel Meuse–Argonne |
| | 6th Division ("Sight-Seeing Sixth") | 26 November 1917 | 31 August 1918 | Brig. Gen. James B. Erwin Maj. Gen. Walter H. Gordon | Meuse–Argonne |
| | 7th Division ("Hourglass Division") | 6 December 1917 | 10 October 1918 | Brig. Gen. Charles H. Barth Maj. Gen. Edmund Wittenmyer | Meuse–Argonne |
| | 8th Division ("Golden Arrow Division"; "Pathfinder Division") | 17 December 1917 | 15 August 1918 | Brig. Gen. Joseph D. Leitch Maj. Gen. John F. Morrison Maj. Gen. William S. Graves Maj. Gen. Eli A. Helmick | Siberia |
| | 9th Division ("Varsity") | 18 July 1918 | No Combat | Maj. Gen. Willard Ames Holbrook | - |
| | 10th Division | 9 July 1918 | No Combat | Maj. Gen. Leonard Wood | - |
| | 11th Division ("Lafayette Division") | 15 August 1918 | No Combat | Maj. Gen. Jesse McI. Carter | - |
| | 12th Division ("Plymouth Division") | 12 July 1918 | No Combat | Maj. Gen. Henry P. McCain | - |
| | 13th Division ("Lucky 13th") | 16 July 1918 | No Combat | Brig. Gen. Cornelius Vanderbilt Brig. Gen. Frank B. Watson Maj. Gen. Joseph D. Leitch | - |
| | 14th Division ("Wolverine Division") | 9 July 1918 | No Combat | Brig. Gen. Howard L. Laubach Maj. Gen. Grote Hutcheson | - |
| Insignia Never Selected | 15th Division | 31 July 1918 | No Combat | Brig. Gen. Guy V. Henry Jr. | - |
| | 16th Division | 31 July 1918 | No Combat | Maj. Gen. David C. Shanks Maj. Gen. Guy Carleton | - |
| | 17th Division | 31 July 1918 | No Combat | Maj. Gen. Henry C. Hodges Jr. | - |
| | 18th Division ("Cactus Division") | 31 July 1918 | No Combat | Brig. Gen. George H. Estes Brig. Gen. Frederick B. Shaw | - |
| Insignia Never Selected | 19th Division | 31 July 1918 | No Combat | Brig. Gen. Benjamin T. Simmons Maj. Gen. Charles C. Ballou | - |
| | 20th Division | 31 July 1918 | No Combat | Brig. Gen. E. Leroy Sweetser Maj. Gen. Harry F Hodges | - |

#### National Guard

Infantry Divisions :
| Name (National Guard units from) | Activated | Entered Combat | Commanding General | Campaigns |
| 26th Division ("Yankee Division") (Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont) | 18 July 1917 | 10 April 1918 | Maj. Gen. Clarence R. Edwards Brig. Gen. Frank E. Bamford | Champagne-Marne Aisne-Marne Saint-Mihiel Meuse–Argonne |
| 27th Division ("New York Division" and "Orion Division") (New York) | 15 July 1917 | 25 July 1918 | Maj. Gen. John F. O'Ryan | Somme Offensive Ypres-Lys Meuse–Argonne (Artillery Only) |
| 28th Division ("Keystone Division") (Pennsylvania) | 5 August 1917 | 14 July 1918 | Maj. Gen. Charles H. Muir Maj. Gen. William H. Hay | Champagne-Marne Oise-Aisne Aisne-Marne Saint-Mihiel Meuse–Argonne |
| 29th Division ("Blue and Grey Division") (Delaware, Maryland, New Jersey, Virginia, Washington D.C.) | 18 July 1917 | 29 September 1918 | Maj. Gen. Charles G. Morton | Meuse–Argonne |
| 30th Division ("Old Hickory Division") (Georgia, North Carolina, South Carolina, Tennessee) | 28 August 1917 | 5 July 1918 | Maj. Gen. John F. Morrison Maj. Gen. Clarence P. Townsley Maj. Gen. George W. Read Maj. Gen. Edward M. Lewis | Somme Offensive Ypres-Lys |
| 31st Division ("Dixie Division") (Alabama, Florida, Georgia) | 25 August 1917 | No Combat (Depot Division) | Maj. Gen. Francis J. Kernan Brig. Gen. John L. Hayden Maj. Gen. Francis H. French Maj. Gen. LeRoy S. Lyon | - |
| 32nd Division ("Les Terribles"; "Red Arrow Division") (Michigan and Wisconsin) | 26 August 1917 | 15 July 1918 | Maj. Gen. James Parker Maj. Gen. William G. Haan Maj. Gen. William Lassiter | Oise-Aisne Aisne-Marne Meuse–Argonne |
| 33rd Division ("Prairie Division") (Illinois) | 25 August 1917 | 17 July 1918 | Maj. Gen. George Bell Jr. | Somme Offensive Meuse–Argonne |
| 34th Division ("Red Bull Division") (Iowa, Nebraska, North Dakota, South Dakota) | 18 July 1917 | No Combat (Depot Division) | Maj. Gen. Augustus P. Blocksom Brig. Gen. John A. Johnston Maj. Gen. Charles D. Rhodes | - |
| 35th Division ("Santa Fe Division") (Kansas and Missouri) | 18 July 1917 | 26 September 1918 | Maj. Gen. William M. Wright Brig. Gen. Nathaniel F. McClure Maj. Gen. Peter E. Traub | Meuse–Argonne |
| 36th Division ("Texas Division" or "Arrowhead Division") (Texas and Oklahoma) | 18 July 1917 | 10 October 1918 | Maj. Gen. Edwin St. John Greble Maj. Gen. William R. Smith | Meuse–Argonne |
| 37th Division ("Buckeye Division") (Ohio) | 26 August 1917 | 4 August 1918 | Maj. Gen. Charles Treat Brig. Gen. Joseph A. Gaston Maj. Gen. Charles S. Farnsworth | Meuse–Argonne Ypres-Lys |
| 38th Division ("Cyclone Division") (Indiana, Kentucky, West Virginia) | 25 August 1917 | No Combat (Depot Division) | Maj. Gen. William H. Sage Brig. Gen. William V. Judson Augustine McIntyre Jr. Brig. Gen. Frank M. Caldwell Maj. Gen. Robert Lee Howze | - |
| 39th Division ("Delta Division") (Arkansas, Louisiana, Mississippi) | 18 July 1917 | No Combat (Depot Division) | Maj. Gen. Henry C. Hodges Jr. Brig. Gen. Ira A. Haynes | - |
| 40th Division ("Sunshine Division") (Arizona, California, Colorado, Nevada, New Mexico, Utah) | 18 July 1917 | No Combat (Depot Division) | Maj. Gen. Frederick S. Strong Brig. Gen. LeRoy S. Lyon Brig. Gen. George H. Cameron | - |
| 41st Division ("Sunset Division") (Idaho, Montana, Oregon, Washington, Wyoming) | 18 July 1917 | No Combat (Depot Division) | Maj. Gen. Hunter Liggett Brig. Gen. Henry Jervey Brig. Gen. George L. Irwin Brig. Gen. Richard Coulter Jr. Brig. Gen. Robert Alexander Brig. Gen. Edward Vollrath Maj. Gen. John E. McMahon Brig. Gen. Eli K. Cole, USMC Maj. Gen. Peter E. Traub | Meuse–Argonne (Artillery Only) |
| 42nd Division ("Rainbow Division") | 1 August 1917 | 16 June 1918 | Maj. Gen. William A. Mann Maj. Gen. Charles T. Menoher Maj. Gen. Charles D. Rhodes Brig. Gen. Douglas MacArthur | Champagne-Marne Saint-Mihiel Meuse–Argonne |

#### National Army (76th-93rd)

Infantry Divisions :
| Name | Activated | Entered Combat | Commanding General | Campaigns |
| 76th Division ("Liberty Bell Division"; "Onaway Division") | 25 August 1917 | No Combat (Depot Division) | Maj. Gen. Harry F. Hodges Brig. Gen. William Weigel Brig. Gen. Frank H. Albright | - |
| 77th Division ("Statue of Liberty Division") | 5 August 1917 | 21 June 1918 | Maj. Gen. J. Franklin Bell Maj. Gen. George B. Duncan Brig. Gen. Evan M. Johnson Maj. Gen. Robert Alexander | Oise-Aisne Meuse–Argonne |
| 78th Division ("Lightning Division") | 5 August 1917 | 12 September 1918 | Maj. Gen. Chase W. Kennedy Brig. Gen. John S. Mallory Brig. Gen. James T. Dean Maj. Gen. Hugh L. Scott Maj. Gen. James McRae | Saint-Mihiel Meuse–Argonne |
| 79th Division ("Cross of Lorraine Division") | 5 August 1917 | 15 September 1918 | Maj. Gen. Joseph E. Kuhn | Meuse–Argonne |
| 80th Division ("Blue Ridge Division") | 5 August 1917 | 23 July 1917 | Brig. Gen. Herman Hall Maj. Gen. Adelbert Cronkhite Brig. Gen. Lloyd M. Brett Brig. Gen. Wilds P. Richardson Brig. Gen. Charles S. Farnsworth Maj. Gen. Samuel D. Sturgis Jr. | Somme Offensive Meuse–Argonne |
| 81st Division ("Wildcat Division") | 5 August 1917 | 2 November 1918 | Maj. Gen. Charles H. Barth Maj. Gen. Charles J. Bailey Brig. Gen. George W. McIver | Meuse–Argonne |
| 82nd Division ("All-American Division") | 5 August 1917 | 18 July 1918 | Maj. Gen. Eben Swift Maj. Gen. William P. Burnham Maj. Gen. George B. Duncan | Saint-Mihiel Meuse–Argonne |
| 83rd Division ("Ohio Division") | 5 August 1917 | None (Depot Division) | Maj. Gen. Edwin F. Glenn Brig. Gen. Willard A. Holbrook | Vittorio Veneto (332nd Infantry only) |
| 84th Division ("Railsplitters") | 5 August 1917 | None (Depot Division) | Maj. Gen. Harry C. Hale Brig. Gen. Wilber E. Wilder | - |
| 85th Division ("Custer Division") | 5 August 1917 | None (Depot Division) | Maj. Gen. Joseph T. Dickman Maj. Gen. James Parker Maj. Gen. Chase W. Kennedy | - |
| 86th Division ("Blackhawk Division") | 5 August 1917 | None (Depot Division) | Maj. Gen. Thomas H. Barry Brig. Gen. Lyman W. V. Kennon Maj. Gen. Charles Martin Brig. Gen. Lincoln C. Andrews Maj. Gen. Charles C. Ballou | - |
| 87th Division ("Golden Acorn Division") | 5 August 1917 | None (Depot Division) | Maj. Gen. Samuel D. Sturgis Brig. Gen. William F. Martin | - |
| 88th Division ("Fighting Blue Devils"; "Clover Leaf Division") | 5 August 1917 | 7 October 1918 | Maj. Gen. Edward H. Plummer Brig. Gen. Robert N. Getty Brig. Gen. William D. Beach Maj. Gen. William Weigel | Meuse–Argonne |
| 89th Division ("Rolling W") | 5 August 1917 | 12 September 1918 | Maj. Gen. Leonard Wood Maj. Gen. William M. Wright Maj. Gen. Frank L. Winn | Saint-Mihiel Meuse–Argonne |
| 90th Division ("Tough 'Ombres") | 5 August 1917 | 12 September 1918 | Maj. Gen. Henry T. Allen Maj. Gen. Charles Martin | Saint-Mihiel Meuse–Argonne |
| 91st Division ("Pine Tree Division"; "Wild West Division") | 5 August 1917 | 26 September 1918 | Maj. Gen. Henry A. Greene Maj. Gen. William Johnston Jr. | Meuse–Argonne |
| 92nd Division (Colored) ("Buffalo Soldiers") | 24 October 1917 | 26 September 1918 | Maj. Gen. Charles C. Ballou Maj. Gen. Charles Martin Brig. Gen. James B. Erwin | Meuse–Argonne |
| 93rd Division (Colored) ("Blue Helmets") (only infantry organized) | 23 November 1917 | 8 April 1918 | Brig. Gen. Roy Hoffman | Third Aisne Second Marne |

#### National Army (94th-102nd)

Infantry Divisions :
| Name | Activated | Commanding General | Area of Origin |
| 94th Division (Only Infantry Organized) | 6 June 1918 | None | Puerto Rico |
| 95th Division (Not Fully Organized) | 5 September 1918 | Col. Julien E. V. Gaujot Col. Edward Croft Brig. Gen. Mathew C. Smith | - |
| 96th Division (Not Fully Organized) | 5 September 1918 | Maj. Gen. Guy Carleton | - |
| 97th Division (Not Fully Organized) | 5 September 1918 | Col. Carl A. Martin Brig. Gen. James R. Lindsay | Minnesota Oklahoma |
| 98th Division (Only HQ Organized) | 23 July 1918 | Col. Jennings B. Wilson (Chief of Staff) | - |
| 99th Division (Only HQ Organized) | 23 July 1918 | Lt. Col. Paul W. Beck (Chief of Staff) | - |
| 100th Division (Only HQ Organized) | 23 July 1918 | Col. William L. Reed (Chief of Staff) | - |
| 101st Division (Only HQ Organized) | 23 July 1918 | Col. Patrick H. Mullay (Chief of Staff) | - |
| 102nd Division (Only Cadre Organized) | 23 July 1918 | None | - |

## Brigades
### Infantry brigades
#### Regular Army

Infantry Brigades :
| Name | Parent Organization | Activated | Organic Units | Commanding General |
| 1st Infantry Brigade | 1st Division | May 24, 1917 | 16th Infantry Regiment 18th Infantry Regiment 2nd Machine Gun Battalion | Brig. Gen. Omar Bundy Brig Gen. George B. Duncan Brig. Gen. John L. Hines Brig. Gen. Frank Parker Col. Hjalmar Erickson |
| 2nd Infantry Brigade | 1st Division | May 24, 1917 | 26th Infantry Regiment 28th Infantry Regiment 3rd Machine Gun Battalion | Brig. Gen. Robert Lee Bullard Brig. Gen. Beaumont B. Buck Brig. Gen. Frank E. Bamford Brig. Gen. George C. Barnhardt Brig. Gen. Francis Marshall |
| 3rd Infantry Brigade | 2nd Division | October 6, 1917 | 9th Infantry Regiment 23rd Infantry Regiment 5th Machine Gun Battalion | Col. Walter K. Wright Brig. Gen. Peter Murray Brig. Gen. Edward M. Lewis Brig. Gen. Hanson E. Ely Col. Robert O. Van Horn Col. James C. Rhea Brig. Gen. Charles E. Kilbourne Brig. Gen. Thomas W. Darrah Brig. Gen. Paul B. Malone |
| 4th Marine Brigade | 2nd Division | October 23, 1917 | 5th Marine Regiment 6th Marine Regiment 6th Machine Gun Battalion | Brig. Gen. Charles A. Doyen Brig. Gen. James Harbord Brig. Gen. John Lejeune Brig. Gen. Wendell C. Neville |

### Depot brigades

* 151st Depot Brigade
* 152nd Depot Brigade
* 153rd Depot Brigade
* 154th Depot Brigade
* 155th Depot Brigade
* 156th Depot Brigade
* 157th Depot Brigade
* 158th Depot Brigade
* 159th Depot Brigade
* 160th Depot Brigade
* 161st Depot Brigade
* 162nd Depot Brigade
* 163rd Depot Brigade
* 164th Depot Brigade
* 165th Depot Brigade
* 166th Depot Brigade
* 167th Depot Brigade

## Technical Services
### Motor transport Corps

* The Motor Transport Corps of the United States Army during World War 1

### Coast artillery corps

* United States Army Coast Artillery Corps - provided almost all US-manned heavy and railway artillery units

### Tank corps

* United States Tank Corps

### Signal corps

* United States Army Signal Corps
* Aviation Section, U.S. Signal Corps
* List of American Aero Squadrons
* List of American Balloon Squadrons