25th Infantry Division Order of Battle during the Vietnam War

Infantry Battalions

• 1st Battalion, 5th Infantry Regiment (Mechanized)
• 4th Battalion, 9th Infantry Regiment
• 2nd Battalion, 12th Infantry Regiment
• 1st Battalion, 14th Infantry Regiment
• 2nd Battalion, 14th Infantry Regiment
• 2nd Battalion, 22nd Infantry Regiment (Mechanized)
• 3rd Battalion, 22nd Infantry Regiment
• 4th Battalion, 23rd Infantry Regiment (Mechanized)
• 1st Battalion, 27th Infantry Regiment
• 2nd Battalion, 27th Infantry Regiment
• 1st Battalion, 35th Infantry Regiment
• 2nd Battalion, 35th Infantry Regiment

Division Artillery

• 1st Battalion, 8th Artillery Regiment (105mm)
• 2nd Battalion, 9th Artillery Regiment (105mm)
• 7th Battalion, 11th Artillery Regiment (105mm)
• 3rd Battalion, 13th Artillery Regiment (155mm)
• 2nd Battalion, 77th Artillery Regiment (105mm)
• 6th Battalion, 77th Artillery Regiment (105mm)

Armor Battalions

• 2nd Battalion, 34th Armored Regiment
• 1st Battalion, 69th Armored Regiment

Aviation Units
25th Aviation Battalion

Division Reconnaissance

• 3rd Squadron, 4th Cavalry Regiment (Armored)
• Company F, 50th Infantry (Long Range Recon)
• Company F, 75th Infantry (Ranger)

Division Support Units

• 1st Support Battalion (Provisional)
• 2nd Support Battalion (Provisional)
• 3rd Support Battalion (Provisional)
• 65th Engineer Battalion
• 25th Medical Battalion
• 25th Supply & Transport Battalion
• 125th Signal Battalion
• 25th Administrative Company
• 725th Maintenance Battalion
• 25th Military Police Company
• 372nd Army Security Agency Company
• 25th Military Intelligence Company
• 9th Chemical Detachment
• 18th Military History Detachment
• 15th Public Information Detachment
• 20th Public Information Detachment

Temporarily Assigned

• 1st Squadron, 11th Armored Cavalry Regiment
• 3rd Squadron, 11th Armored Cavalry Regiment
• 3rd Brigade, 9th Infantry Division

Primary Sources:
"Vietnam Order of Battle" by Shelby L. Stanton
http://cybersarges.tripod.com/25history.html (http://cybersarges.tripod.com/25history.html)
http://en.wikipedia.org/wiki/25th_Infantry_Division_%28United_States%29 (http://en.wikipedia.org/wiki/25th_Infantry_Division_%28United_States%29)

Good Hunting.

MR