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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:

Army groups

Field armies

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

Armored corps

Army corps

Army divisions

Air assault divisions

Airborne divisions

Armored divisions

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 (Later redesignated as 1st 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

Light divisions

Mountain divisions

Reserve training divisions

See also

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