Here is the full list of active-duty military units deployed to the southern border

U.S. Army Soldiers arrive at Joint Base San Antonio - Lackland

More than two weeks after the Pentagon announced that 3,750 active-duty troops were deploying to the southwestern border, U.S. Northern Command has identified the active-duty units taking part in the mission.

With the most recent deployment, there are currently more than 4,000 active-duty troops on the U.S./Mexico border. They come from the following units:


  • 819th Red Horse Squadron


  • 36th Engineer Brigade
  • 5th Engineer Battalion
  • 563rd Military Police Company
  • 595th Engineer Company
  • 161st Engineer Support Company
  • Alpha Company, 52nd Engineer Battalion
  • Alpha Company, 16th Engineer Battalion
  • Forward Support Company, 5th Engineer Battalion
  • 1st Support Maintenance Company
  • 542nd Support Maintenance Company
  • 584th Support Maintenance Company
  • 46th Engineer BattalionForward Support Company, 46th Engineer Battalion
  • 108th Military Police Company
  • 515th Engineer Company
  • 610th Engineer Support Company
  • 147th Support Maintenance Company
  • 602nd Support Maintenance Company
  • 503rd Military Police Battalion
  • 66th Military Police Company
  • 41st Engineer Company
  • 4th Sustainment Brigade
  • 264th Combat Sustainment Support Battalion
  • 227th Quartermaster Company
  • 178th Adjutant General Company
  • 126th Transportation Company
  • 155th Transportation Company
  • 377th Transportation Company
  • 259th Movement Control Team
  • 153rd Quartermaster Company
  • 1st Squadron, 14th Cavalry Regiment
  • Alpha Company, 1st Squadron, 14th Cavalry Regiment
  • Bravo Company, 1st Squadron, 14th Cavalry Regiment
  • Charlie Company, 1st Squadron, 14th Cavalry Regiment
  • 1st Battalion, 37th Field Artillery Regiment
  • Headquarters and Headquarters Battery, 1st Battalion, 37th Field Artillery Regiment
  • Charlie Company, 1st Battalion, 37th Field Artillery Regiment
  • Charlie Company, 1st Battalion, 23rd Infantry Battalion
  • 3rd Combat Aviation Brigade
  • 4th Battalion, 3rd Combat Aviation Brigade
  • 24th Theater Public Affairs Support Element
  • 63rd Expeditionary Signal Battalion
  • 505th Military Intelligence Brigade


  • 7th Engineer Support Battalion
  • Alpha Company, 1st Law Enforcement Battalion
  • Echo Company, 2nd Battalion, 5th Marine Regiment
  • Fox Company, 2nd Battalion, 5th Marine Regiment
  • Golf Company, 2nd Battalion, 5th Marine Regiment
  • Weapons Company, 2nd Battalion, 5th Marine Regiment
  • CE Company, 7th Engineer Support Battalion
  • Combat Logistics Battalion 5
  • 1st Light Armored Reconnaissance Battalion
  • Echo Company, 2nd Battalion, 4th Marine Regiment
  • Golf Company, 2nd Battalion, 4th Marine Regiment

CORRECTION: This story was corrected on March 3 to reflect the Marines from 2nd Battalion, 5th Marine Regiment are from Echo, Fox, Golf, and Weapons companies.

SEE ALSO: 'Relax,' US Troops On The Border Are Not There To Shoot Migrants, Mattis Says

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Editor's Note: This article by Oriana Pawlyk originally appeared on, a leading source of news for the military and veteran community.

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