Infantry

• 1st U.S. Infantry Regiment
• 2nd U.S. Infantry Regiment
  2nd Infantry Regiment (United States)
  The 2nd Infantry Regiment is an infantry regiment in the United States Army. It has served the United States for more than two hundred years. It is the third oldest regiment in the US Army with a Lineage date of 1808 and a history extending back to 1791...
  
  
• 3rd U.S. Infantry Regiment
• 4th U.S. Infantry Regiment
• 5th U.S. Infantry Regiment
  5th Infantry Regiment (United States)
  The 5th Infantry Regiment is the third-oldest infantry regiment of the United States Army, tracing its origins to 1808...
  
  
• 6th U.S. Infantry Regiment
• 7th U.S. Infantry Regiment
  7th Infantry Regiment (United States)
  The United States Army's 7th Infantry Regiment, known as "The Cottenbalers" from an incident that occurred during the Battle of New Orleans, while under the command of Andrew Jackson, when soldiers of the 7th Infantry Regiment held positions behind a breastwork of bales of cotton during the...
  
  
• 8th U.S. Infantry Regiment
• 9th U.S. Infantry Regiment
• 10th U.S. Infantry Regiment
• 11th U.S. Infantry Regiment
  11th Infantry Regiment (United States)
  The 11th Infantry Regiment is a regiment in the United States Army.-The First 11th Infantry:Under the authority granted the President by the Act of July 16, 1798, to raise twelve additional regiments of infantry, the first 11th Infantry came into existence in the Army of the United States in...
  
  
• 12th U.S. Infantry Regiment
• 13th U.S. Infantry Regiment
  13th Infantry Regiment (United States)
  The 13th Infantry Regiment is a United States Army infantry regiment whose battalions are currently tasked as basic training battalions.- History :...
  
  
• 14th U.S. Infantry Regiment
• 15th U.S. Infantry Regiment
• 16th U.S. Infantry Regiment
  16th Infantry Regiment (United States)
  The 16th Infantry Regiment is a regiment in the United States Army.-Formation:The 34th Infantry Regiment and 11th Infantry Regiment consolidated into the 16th Infantry Regiment on 3 March 1869. The 11th Infantry's history prior to the consolidation is normally included with the 16th's.-U.S...
  
  
• 17th U.S. Infantry Regiment
  17th Infantry Regiment (United States)
  The 17th Infantry Regiment is a United States Army infantry regiment. While the 17th Infantry Regiment was organized on January 11, 1812, it was consolidated with the 3rd Infantry due to extremely heavy losses at Frenchtown, and lost its identity two years later until May 3, 1861, when it was...
  
  
• 18th U.S. Infantry Regiment
• 19th U.S. Infantry Regiment
  19th Infantry Regiment (United States)
  The 19th Infantry Regiment is a United States Army infantry regiment which is assigned to the US Army Training and Doctrine Command, with the assignment of conducting Basic and Advanced Infantry Training.-Civil War:...
  
  

Cavalry

• 1st U.S. Cavalry Regiment
• 2nd U.S. Cavalry Regiment
• 3rd U.S. Cavalry Regiment
• 4th U.S. Cavalry Regiment
• 5th U.S. Cavalry Regiment
• 6th U.S. Cavalry Regiment

Artillery

• 1st U.S. Artillery Regiment
• 2nd U.S. Artillery Regiment
  2nd Air Defense Artillery Regiment (United States)
  The 2nd Air Defense Artillery Regiment is an air defense artillery regiment of the United States Army first formed in 1821.-Lineage:Constituted 1 June 1821 in the Regular Army as the 2nd Regiment of Artillery and organized from existing units with Headquarters at Baltimore, MarylandRegiment broken...
  
  
• 3rd U.S. Artillery Regiment
  3rd Air Defense Artillery Regiment (United States)
  The 3rd Air Defense Artillery Regiment is an air defense artillery regiment of the United States Army first formed in 1821 as the 3rd Regiment of Artillery.-History:...
  
  
• 4th U.S. Artillery Regiment
  4th Air Defense Artillery Regiment (United States)
  The 4th Air Defense Artillery Regiment was constituted 1 June 1821 in the Regular Army as the 4th Regiment of Artillery and organized from new and existing units with Headquarters at Pensacola, Florida...
  
  
• 5th U.S. Artillery Regiment
  5th Air Defense Artillery Regiment (United States)
  The 5th Air Defense Artillery Regiment is an air defense artillery regiment of the United States Army first formed in 1861 as the 5th Regiment of Artillery.-Linage:...