See also: Formations of the United States Army. This is a list of current formations of the United States Army, which is constantly changing as the Army changes its structure over time. Due to the nature of those changes, specifically the restructuring of brigades into autonomous modular brigades, debate has arisen as to whether brigades are units or formations; for the purposes of this list, brigades are currently excluded. Active status formations are shown in bold.
First United States Army – U.S. Army Training, Readiness, and Mobilization Command formation at Rock Island Arsenal, Illinois
Third United States Army – United States Army Central command formation headquartered at Shaw AFB
Fifth United States Army – United States Army North command formation at Joint Base San Antonio, Texas
Sixth United States Army – United States Army South command formation at Joint Base San Antonio, Texas
Eighth United States Army – United States Forces Korea command formation at Camp Humphreys, South Korea
I Corps "America's Corps" at Fort Lewis, Washington
III Armored Corps "Phantom Corps" at Fort Cavazos, Texas
V Corps "Victory Corps" at Fort Knox, Kentucky
XVIII Airborne Corps "Sky Dragons" at Fort Liberty, North Carolina
11th Airborne Division "Arctic Angels" at Joint Base Elmendorf-Richardson, Alaska
82nd Airborne Division "All American" at Fort Liberty, North Carolina
101st Airborne Division (Air Assault) "Screaming Eagles" at Fort Campbell, Kentucky
1st Armored Division "Old Ironsides" at Fort Bliss, Texas
1st Cavalry Division "First Team" at Fort Cavazos, Texas
1st Infantry Division "The Big Red One" at Fort Riley, Kansas
'2nd Infantry Division "Indian Head Division" at Camp Humphreys, South Korea
3rd Infantry Division "Rock of the Marne" at Fort Stewart, Georgia
4th Infantry Division "Ivy Division/Iron Horse" at Fort Carson, Colorado
7th Infantry Division “The Hourglass Division” at Joint Base Lewis-McChord, Washington
10th Mountain Division at Fort Drum, New York
25th Infantry Division "Tropic Lightning" at Schofield Barracks, Hawaii
28th Infantry Division (ARNG) "Keystone Division" at Harrisburg, Pennsylvania
29th Infantry Division (ARNG) "The Blue and Gray" at Fort Belvoir, Virginia
34th Infantry Division (ARNG) "Red Bull Division" at Rosemount, Minnesota
35th Infantry Division (ARNG) "Santa Fe Division" at Fort Leavenworth, Kansas
36th Infantry Division (ARNG) "Arrowhead Division" at Camp Mabry, Austin, Texas
38th Infantry Division (ARNG) "Cyclone Division" at Indianapolis, Indiana
40th Infantry Division (ARNG) "Sunburst Division" at Los Alamitos, California
42nd Infantry Division (ARNG) "Rainbow Division" at Troy, New York
78th Training Division (Operations) (USAR) "Lightning" at Joint Base McGuire–Dix–Lakehurst, New Jersey
86th Training Division (Decisive Action) (USAR) "Blackhawk Division" at Fort McCoy, Wisconsin
91st Division (Operations) (USAR) "Wild West Division" at Fort Hunter Liggett, California
94th Division (Force Sustainment) (USAR) at Fort Gregg-Adams, Virginia
95th Division (Institutional Training) (USAR) "Victory Division" at Fort Sill, Oklahoma
98th Training Division (Initial Entry Training) (USAR) "Iroquois" at Fort Moore, Georgia
100th Division (Institutional Training) (USAR) "Century Division" at Fort Knox, Kentucky
102nd Division (Maneuver Support) (USAR) "Ozark" at Fort Leonard Wood, Missouri
104th Division (Leader Training) (USAR) "Timberwolf Division" at Joint Base Lewis–McChord, Washington
173rd Airborne Brigade Combat Team "Sky Soldiers" at Vicenza, Italy
11th Air Defense Artillery Brigade at Fort Bliss, Texas
31st Air Defense Artillery Brigade at Fort Sill, Oklahoma
35th Air Defense Artillery Brigade at Osan Air Base, South Korea
38th Air Defense Artillery Brigade at Sagami General Depot, Japan
69th Air Defense Artillery Brigade at Fort Cavazos, Texas
100th Missile Defense Brigade (ARNG) at Colorado Springs, Colorado
108th Air Defense Artillery Brigade at Fort Liberty, North Carolina
164th Air Defense Artillery Brigade (ARNG) at Orlando, Florida
174th Air Defense Artillery Brigade (ARNG) at Columbus, Ohio
678th Air Defense Artillery Brigade (ARNG) at Eastover, South Carolina
5th Armored Brigade (USAR) "Dagger Brigade" at Fort Bliss, Texas
30th Armored Brigade Combat Team (ARNG) "Old Hickory" at Clinton, North Carolina
81st Stryker Brigade Combat Team (ARNG) "Cascade Rifles" at Seattle, Washington
155th Armored Brigade Combat Team (ARNG) "Dixie Thunder" at Tupelo, Mississippi
177th Armored Brigade (USAR) at Camp Shelby, Mississippi
194th Armored Brigade at Fort Moore, Georgia
1st Aviation Brigade at Fort Novosel, Alabama
11th Expeditionary Combat Aviation Brigade (USAR) "We Make The Difference" at Fort Carson, Colorado
12th Combat Aviation Brigade "Wings of Victory" at Katterbach Kaserne, Germany
16th Combat Aviation Brigade "Born In Battle" at Joint Base Lewis-McChord, Washington
29th Combat Aviation Brigade (ARNG) "Lets Go!!" at Edgewood, MD, APG, Maryland
63rd Theater Aviation Brigade (ARNG) "Wings of Thunder" at Frankfort, Kentucky
77th Combat Aviation Brigade (ARNG) at Robinson Maneuver Training Center, Arkansas
110th Aviation Brigade "Warriors" at Fort Novosel, Alabama
128th Aviation Brigade at Fort Novosel, Alabama
166th Aviation Brigade (USAR) at Fort Cavazos, Texas
185th Aviation Brigade (ARNG) at Tupelo, Mississippi
244th Expeditionary Combat Aviation Brigade (USAR) at Fort Knox, Kentucky
201st Expeditionary Military Intelligence Brigade "With Courage and Vision" at Joint Base Lewis-McChord, Washington
504th Expeditionary Military Intelligence Brigade "Always Ready" at Fort Cavazos, Texas
525th Expeditionary Military Intelligence Brigade at Fort Liberty, North Carolina
20th Engineer Brigade at Fort Liberty, North Carolina
36th Engineer Brigade at Fort Cavazos, Texas
130th Engineer Brigade at Schofield Barracks, Hawaii
555th Engineer Brigade at Joint Base Lewis-McChord, Washington
17th Field Artillery Brigade at Joint Base Lewis-McChord, Washington
18th Field Artillery Brigade at Fort Liberty
75th Field Artillery Brigade at Fort Sill
210th Field Artillery Brigade at Camp Casey
1st Special Forces Group (Airborne) at Joint Base Lewis–McChord, Washington
3rd Special Forces Group (Airborne) at Fort Liberty, North Carolina
5th Special Forces Group (Airborne) at Fort Campbell, Kentucky
7th Special Forces Group (Airborne) at Eglin AFB, Florida
10th Special Forces Group (Airborne) at Fort Carson, Colorado
19th Special Forces Group (Airborne) at Draper, UT
20th Special Forces Group (Airborne) at Birmingham, AL
56th Theater Information Operations Group (ARNG) at Joint Base Lewis–McChord, Washington
71st Theater Information Operations Group (ARNG) at Camp Mabry, TX
151st Theater Information Operations Group (USAR) at Fort Totten (Queens), NY
2nd Cavalry Regiment "Second Dragoons" at Vilseck, Germany
3rd Cavalry Regiment "Brave Rifles" at Fort Cavazos, Texas
3rd Infantry Regiment "The Old Guard" at Fort Myer, Virginia (1st and 4th Battalions only; the 2nd Battalion of the 3rd Infantry Regiment is an independent battalion serving a separate command at Fort Lewis, Washington)
11th Armored Cavalry Regiment "Blackhorse" at Fort Irwin, California
278th Armored Cavalry Regiment (ARNG) "I Volunteer, Sir!" at Knoxville, Tennessee.
75th Ranger Regiment at Fort Moore, Georgia
160th Special Operations Aviation Regiment (Airborne) "Night Stalkers" at Fort Campbell, Kentucky