List of formations of the United States Army

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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