United States Army

The United States Army (USA) is the primary land service branch of the United States Department of Defense.

Organization

Operational Force

The U.S. Army's Earth-based operational force before the theater service component-level consists of 5 active corps (I Corps, III Corps, V Corps, VII Airmobile Corps, XIV Corps) controlling 15 active duty divisions, 9 Army National Guard divisions, and many separate combat commands, brigades, and regiments. During peacetime, forces forward deployed or rotated to China, Japan, and Southeast Asia come under the command of the Sixth Army as the theater-level service component command. Corps stationed in the United States remain under the administration of the Eighth Army. During wartime, corps designated as "Reforc Corps A and B" (I Corps and III Corps) and the forward deployed corps in China (IX Corps) would come under the Sixth Army while any other follow-on forces would come under the Eighth Army and any other mobilized commands depending on the scale of conflict. Alternatively, if a large-scale conflict occurs outside of the Pacific area, Eighth Army can deploy as the Army's service component command to that theater.

In addition, the Army bases the 12th Infantry Division on the Moon (including two lunar Army National Guard regiments) directly under the Second Army. The Second Army commands all exoatmospheric army units, including space elevator terminal battalions, separate battalions and companies stationed on the lunar surface, and units conducting space station and asteroid operations.

• 
  I Corps
  (Reforc Corps A)
• 
  IX Corps
  (Forward Deployed to China)

File:Eighth United States Army CSIB.svg Eighth Army

• File:U.S. I Corps CSIB.svg I Corps
  • 4th Tank Division
  • File:11th Airborne Division.patch.svg 11th Airborne Division (Composite Airborne/Airmobile)
  • File:24 Infantry Division SSI.svg 24th Infantry Division (Light) (Amphibious)
  • File:25th Infantry Division shoulder sleeve insignia.png 25th Infantry Division (Light) (Jungle)
  • File:40th Infantry Division CSIB.svg 40th Tank Division (CA ARNG)
• File:III Armored Corps Distinctive Unit Insignia.svg III Corps
  • File:1st Infantry Division SSI (1918-2015).svg 1st Infantry Division (Mechanized)
  • 2nd Tank Division
  • File:27th Infantry Division SSI.svg 27th Tank Division (NY ARNG)
  • File:29th Infantry Division SSI.svg 29th Infantry Division (Mechanized) (VI ARNG)
  • Error creating thumbnail: 50th Tank Division (NJ ARNG)
• File:V Corps.svg V Corps
  • File:4th Infantry Division CSIB2.svg 4th Infantry Division (Mechanized)
  • File:US 71st Infantry Division.svg 71st Infantry Division (Light, Arctic)
  • File:30th Infantry Division SSI.svg 30th Tank Division (TN ARNG)
  • File:36th Infantry Division CSIB.svg 36th Infantry Division (Mechanized) (TX ARNG)
  • Error creating thumbnail: 45th Infantry Division (Mechanized) (OK ARNG)
• File:US Army VII Corps SSI Pre-April 28, 1944.png VII Airmobile Corps
  • Error creating thumbnail: 8th Infantry Division (Mechanized)
  • File:Combat service identification badge of the 101st Airborne Division.png 101st Airborne Division (Composite Airborne/Airmobile)
  • 2nd Cavalry Division (Motorized)
  • 92nd Infantry Division (Light) (ARNG)

File:UNITED STATES ARMY SOUTH SSI.svg Sixth Army

• File:US IX Corps SSI.png IX Corps
  • 1st Tank Division
  • File:1st Cavalry Division SSI (1921-2015).svg 1st Cavalry Division (Motorized)
  • 5th Infantry Division (Mechanized)
  • File:7th Infantry Division SSI (1973-2015).svg 7th Infantry Division (Mechanized)
  • File:34th 'Red Bull' Infantry Division SSI.svg 34th Infantry Division (Motorized) (MN ARNG)
• I Corps (Wartime)
• III Corps (Wartime)

File:1st Army.svg First Army

• File:12th Infantry Division SSI.svg 12th Infantry Division (Lunar)

Army Generating Force (AGF)

The Army Generating Force (AGF) consists primarily of training, mobilization, and deployment support capabilities within the United States. This includes all units designated for the initial training of units, national training centers, doctrine developers, and domestic installation commands. In addition to the 5 corps of the Operational Force, there are 4 corps part of the Army Organized Reserve with oversight of 20 cadre divisions to be expanded with draftees upon mobilization. These corps exist under the Generating Force and are aligned to geographically close groupings of states from which they draw draftees during mobilization.