The 25th Infantry Division Organizations Cold War, Peacekeeping and War on Terrorism

(1945-Present)

Introduction: Since its activation in 1941 the 25th Infantry Division (as of 2011) has spent approximately eighteen years of war-time service during World War II, the Korean War, Vietnam and in the War on Terrorism’s expeditionary campaigns in Afghanistan and Iraq. (See Order of Battle.) The remaining fifty-two years have been served maintaining combat-readiness and performing assigned missions that contributed to the security of the United States during the Cold War from 2 September 1945 to 26 December 1991, in Peacekeeping operations from 1992-2001 and in non-expeditionary service in the War on Terrorism beginning on 11 September 2001 to the present. To maintain combat-readiness and to meet and accomplish its missions during these eras the 25th Infantry Division has been organized in a series of different configurations as follows.

1945-1950
25th INFANTRY DIVISION (Occupation)
During the occupation of Japan from 1945-1950, the 25th Infantry Division retained its triangular WWII organization of three infantry regiments. However, two of the infantry regiments were reduced to two battalions each and their supporting artillery battalions had only two firing batteries. In 1949 a modification of the division’s organization led to the adding of an anti-aircraft artillery battalion to the division artillery, a reduced strength tank battalion of one line company as well as additions and reconfigurations of several combat support and combat service support companies. It was in this configuration that the division entered the Korean War. (See Order of Battle.)
4th Infantry Regiment (1)
24th Infantry Regiment (2)
27th Infantry Regiment
35th Infantry Regiment
161st Infantry Regiment (3)

Division Artillery
HQ &HQ Battery
8th Field Artillery Battalion
64th Field Artillery Battalion
89th Field Artillery Battalion (4)
90th Field Artillery Battalion
159th Field Artillery Battalion (2)
25th AAA (AW) Battalion (5)

79th Tank Battalion (-) (5)
25th Mech. Cavalry Recon. Troop (6)
65th Engineer Battalion
77th Engineer Company (7)
25th Signal Company
25th Medical Battalion
25th Quartermaster Company
725th Ordnance Company
Headquarters Special Troops (8)
Military Police Platoon (9)
Division Band
Division HQ &HQ Company

Notes
(1) Assigned from 11/01/45 to 02/01/47
(2) Assigned 02/01/47
(3) Assigned until 11/01/45
(4) Assigned until 12/15/46
(5) Assigned 03/20/49
(6) 03/20/49 redesignated as 25th Recon. Co.
(7) Assigned 02/05/47
(8) 09/25/49 redesignated as 25th Repl. Co.
(9) 03/20/49 redesignated as 25th MP Co.

1957-1963
25th INFANTRY DIVISION (Pentomic)
In 1957, three years after its return from Korea, the 25th Infantry Division along with the rest of the infantry and airborne divisions of the Army underwent a major reorganization for atomic warfare called the “Pentomic Division”. The three infantry regiments (See Regimental System) were replaced by five infantry battle groups. During the period 1957-1963 eight battle groups from seven infantry regiments served in the division with one being stationed on Okinawa. The division artillery was reduced to one 105mm direct support battalion of five firing batteries and a nuclear capable general support battalion consisting two 155mm howitzer batteries, an 8 inch howitzer battery and a rocket battery. Also added to the division, a cavalry squadron, an aviation company, a signal battalion, a division trains headquarters (to control the combat service support organizations) and a transportation battalion. The AAA battalion and the military police company were removed. By 1960 the Army determined that the battle groups lacked adequate direct artillery support. Consequently four additional artillery battalions were assigned. Each of the five direct support battalions was organized to include one 105mm and one 155mm howitzer battery.

1st Battle Group, 5th Infantry (1)
1st Battle Group, 14th Infantry
2nd Battle Group, 19th Infantry (2)
2nd Battle Group, 21st Infantry (3)
1st Battle Group, 27th Infantry
1st Battle Group, 35th Infantry
2nd Battle Group, 35th Infantry (4)
2nd Airborne Battle Group, 503rd Infantry (5)

Division Artillery
HQ & HQ Battery
9th Battalion, 1st Artillery (6)
1st Battalion, 8th Artillery
2nd Battalion, 9th Artillery (7)
7th Battalion, 11th Artillery (7)
3rd Battalion, 13th Artillery (7)
2nd Battalion, 21st Artillery (8)
Battery C (Airborne), 319th Artillery (5)

3rd Battalion, 69th Armor
3rd Squadron, 4th Cavalry
65th Engineer Battalion
125th Signal Battalion
25th Aviation Company

Division Trains
HQ &HQ Detachment
25th Medical Battalion
725th Ordnance Battalion
33rd Transportation Battalion
25th Quartermaster Company
25th Administration Company
Division Band

Division HQ &HQ Company

Notes
(1) Assigned 02/01/63
(2) Assigned 02/01/57-01/26/62
(Inactive 03/25/58-03/01/61)
(3) Assigned 02/01/57- 02/01/63
(4) Assigned 02/19/62
(5) Assigned 06/24/60-07/01/61
Stationed on Okinawa
(6) Assigned 03/01/61
(7) Assigned 04/01/60
(8) Nuclear capable

1963-1966
25th INFANTRY DIVISION (ROAD)
By 1963 the Army concluded that the Pentomic Division with its five battle groups had insufficient combat power and the division command and control was cumbersome. Consequently the Army returned its infantry and airborne divisions to a modified triangular division known as ROAD (Reorganization of the Army Division) of three brigades of three infantry battalions each. The 25th Division undertook its reorganization on 21 June 1963. Because of budget restrictions the Army authorized the 25th Division only seven infantry battalions. The division artillery returned to its traditional organization of three direct support 105mm howitzer battalions and one 155/8 inch self-propelled general support battalion. The 25th Div Arty retained its nuclear capable artillery battalion as well. In other major changes the aviation company was expanded to a battalion; the transportation battalion and quartermaster company was replaced by a supply and transport battalion and the military police company was returned. It was in this configuration with the addition of two infantry battalions from Alaska and leaving the nuclear capable artillery battalion at Schofield that the 25th Division departed for Vietnam in 1966. (See Order of Battle.)

1st Brigade
HQ &HQ Company
1st Battalion, 14th Infantry
2nd Battalion, 14th Infantry

2nd Brigade
HQ &HQ Company
1st Battalion, 5th Infantry
1st Battalion, 27th Infantry
2nd Battalion, 27th Infantry

3rd Brigade
HQ &HQ Company
1st Battalion, 35th Infantry
2nd Battalion, 35th Infantry

Division Artillery
HQ &HQ Battery
1st Battalion, 8th Artillery
2nd Battalion, 9th Artillery
7th Battalion, 11th Artillery
3rd Battalion, 13th Artillery
2nd Battalion, 21st Artillery (1)

1st Battalion, 69th Armor (2)
3rd Squadron, 4th Cavalry
25th Aviation Battalion
65th Engineer Battalion
125th Signal Battalion
25th Military Police Company

Support Command
HQ &HQ Det. & Band
25th Medical Battalion
25th Supply and Transport Battalion
725th Maintenance Battalion
25th Administration Company

Division HQ &HQ Company

Notes
(1) Inactivated 12/01/68 at Schofield
(2) 07/01/63 3rd Bn reflagged as 1st Bn.

1969-1970
4th BRIGADE, 25th INFANTRY DIVISION
To maintain a strategic reserve in the Pacific for contingencies other than Vietnam after the 25th departed for Vietnam, the 29th Infantry Brigade of the Hawaii National Guard was called to Federal service and stationed at Schofield Barracks. In 1969 the 29th was released from Federal service and the 4th Brigade, 25th Infantry Division was constituted and activated at Schofield Barracks on 6 December 1969 under command of United States Army Pacific. It was initially manned by personnel from the 9th Infantry Division returning from Vietnam. The brigade was inactivated on 15 December 1970 upon the return of the 25th Division from Vietnam.

4th Brigade
HQ &HQ Company
2nd Battalion, 5th Infantry
3rd Battalion, 14th Infantry
3rd Battalion, 27th Infantry
5th Battalion, 13th Artillery
Troop H, 10th Cavalry
76th Engineer Company
425th Support Battalion

1970-1972
1st BRIGADE, 25th INFANTRY DIVISION
The 25th Division less the 2nd Brigade returned from Vietnam to Schofield Barracks in late December 1970 with its units at color guard strength. On 18 December 1970, the 4th Brigade was reflagged as the 1st Brigade and two infantry battalions and the artillery battalion were reflagged to battalions returning from Vietnam. The 4th Brigade’s 2nd Battalion, 5th Infantry, the cavalry troop, engineer company and support battalion were reassigned to the 1st Brigade.

1st Brigade
HQ &HQ Company
2nd Battalion, 5th Infantry
1st Battalion, 14th Infantry
1st Battalion, 27th Infantry
3rd Battalion, 13th Artillery
Troop H, 10th Cavalry
76th Engineer Company
425th Support Battalion

1972-1985
25th INFANTRY DIVISION (Minus)
On 5 June 1972 the Army directed that the 25th Division be expanded to a two brigade division to increase its capability as the strategic reserve for the Pacific. Hence the 2nd Brigade which returned from Vietnam in 1971 at color guard strength was brought up to full strength and the 3rd Brigade then at zero strength was officially inactivated. In the event that the 25th required a third brigade the Hawaii National Guard’s 29th Infantry Brigade was designated as the division’s “round-out brigade”. The division artillery had two 105mm howitzer direct support battalions a 155mm howitzer general support battalion and a target acquisition battery. An air defense artillery battalion was added to the division. The 1/69th Armor reassigned back to the division in 1970 was relieved from assignment to the 25th on 5 June 1972. The division base was minus the slice of combat and combat service support units dedicated to support a third brigade.

1st Brigade
HQ &HQ Company
1st Battalion, 5th Infantry
1st Battalion, 19th Infantry
1st Battalion, 27th Infantry

2nd Brigade
HQ &HQ Company
1st Battalion, 14th Infantry
1st Battalion, 21st Infantry
1st Battalion, 35th Infantry

Division Artillery
HQ &HQ Battery
1st Battalion, 8th Field Artillery (1)
7th Battalion, 8th Field Artillery (2)
2nd Battalion, 11th Field Artillery (3)
3rd Battalion, 13th Field Artillery (4)
Battery D, 26th Field Artillery (5)

1st Battalion, 62nd Air Defense Artillery
3rd Squadron, 4th Cavalry
25th Aviation Battalion
65th Engineer Battalion
125th Signal Battalion
25th Military Intelligence Company (6)
25th Military Police Company

Support Command
HQ &HQ Company
25th Supply & Transport Battalion
25th Medical Battalion
725th Maintenance Battalion
25th Adjutant General Company
125th Finance Company

Division HQ &HQ Company

(1) General support battalion
(2) Assigned 10/01/83
(3) Reflagged as 2nd Battalion 09/13/72
(4) Inactivated 10/01/83
(5) Assigned 03/28/78
(6) Assigned 08/21/78. Redesignated 125th MI Bn. 06/16/83

1985 -1995
25th INFANTRY DIVISION (Light)
In 1985 in order to increase its mobility as the strategic reserve for the Pacific, the 25th Infantry Division was reorganized and with the reactivation of the 3rd Brigade was brought to full authorized strength as a light infantry division. Concurrently incorporated into the reorganization was an Army-wide realignment of combat arms regiments to facilitate a regimental personnel manning system whereby soldiers would rotate between elements of the same regiment. As a result, the 25th Division lost all elements of the 5th, 19th and 35th Infantry and the 4th Cavalry; in return the 25th received elements of the 22nd and 87th Infantry, the 7th Field Artillery and the 9th Cavalry.

1st Brigade
HQ &HQ. Company
5th Battalion, 14th Infantry
3rd Battalion, 21st Infantry
1st Battalion, 27th Infantry

2nd Brigade
HQ &HQ Company
1st Battalion, 14th Infantry
1st Battalion, 21st Infantry
4th Battalion, 22nd Infantry

3rd Brigade
HQ &HQ Company
3rd Battalion, 22nd Infantry
4th Battalion, 27th Infantry
4th Battalion, 87th Infantry

Division Artillery
HQ &HQ Battery
3rd Battalion 7th Field Artillery
7th Battalion, 8th Field Artillery
2nd Battalion, 11th Field Artillery
Battery F, 7th Field Artillery
1st Battalion, 8th Field Artillery (1)

Aviation Brigade
HQ &HQ Company
5th Squadron (Air), 9th Cavalry
1st Battalion, 25th Aviation
Company F, 25th Aviation (2)
Company G, 25th Aviation (2)
Company H, 25th Aviation (3)
4th Battalion, 25th Aviation (4)
53rd Aviation Battalion (5)
17th Aviation Company (6)
184th Aviation Company (6)

1st Battalion, 62nd Air Defense Artillery
65th Engineer Battalion
125th Signal Battalion
125th Military Intelligence Battalion
25th Military Police Company

Support Command
HQ & HQ Company
25th Supply & Transportation Battalion (7)
25th Medical Battalion (8)
725th Maintenance Battalion (9)
225th Support Battalion (10)
71st Chemical Company
58th Transportation Company (11)
556th Personnel Services Company
Division Band

Division HQ & HQ Company

Notes:
(1) Attached to 25th DivArty
(2) Assigned 05/16/88 to 09/15/90
(3) Assigned 05/16/88 to 03/15/96
(4) Assigned 05/16/90 to 03/15/96
(5) Assigned 10/16/85 to 01/15/86
(6) Assigned 10/16/85 to 05/16/88
(7) Redesignated as 25th Support Battalion 04/16/92
(8) Redesignated as 325th Support Battalion 04/16/92
(9) Redesignated as 725th Support Battalion 04/16/92
(10) Activated 04/16/92
(11) Aircraft maintenance, assigned 10/16/85 to 05/16/88

1995-2005
25th INFANTRY DIVISION (Light & Stryker)
As part of the draw-down and realignment of the Army after the Gulf War the 1st Brigade was transferred (less personal and equipment) to Fort Lewis Washington in 1995 where the 1st Brigade, 7th Infantry Division was reflagged as the 1st Brigade, 25th Infantry Division. The Army further decided not to implement the regimental personnel manning system and returned to the 25th Division elements of the 5th, 24th, 35th Infantry and the 4th Cavalry, all of which had previously served with the division. In 2002 the 1st Brigade began the transition from a light brigade to a Stryker Brigade Combat Team equipped with the Stryker wheeled armored vehicle.

1st Brigade Combat Team (Stryker) (1)
HQ & HQ Company
1st Battalion, 5th Infantry
5th Battalion, 20th Infantry (2)
3rd Battalion, 21st Infantry (3)
1st Battalion, 24th Infantry
Company D, 52nd Infantry (4)
2nd Squadron, 14th Cavalry (5)
2nd Battalion, 8th Field Artillery
Battery C, 1st Battalion, 62nd ADA
73rd Engineer Company (6)
184th Military Intelligence Company (5)
176th Signal Company (7)
25th Support Battalion
125th Combat Service Support Company (8)

2nd Brigade
HQ & HQ Company
1st Battalion, 14th Infantry
1st Battalion, 21st Infantry
1st Battalion, 27th Infantry

3rd Brigade
HQ & HQ Company
2nd Battalion, 5th Infantry
2nd Battalion, 27th Infantry
2nd Battalion, 35th Infantry

Division Artillery
HQ & HQ Battery
3rd Battalion, 7th Field Artillery
2nd Battalion, 11th Field Artillery
Battery F, 7th Field Artillery

Aviation Brigade
HQ & HQ Company
3rd Squadron (Air), 4th Cavalry
1st Battalion, 25th Aviation
2nd Battalion, 25th Aviation
Company C, 25th Aviation
Company G, 56th Aviation

1st Battalion, 62nd Air Defense Artillery
65th Engineer Battalion (9)
125th Military Intelligence Battalion
125th Signal Battalion
25th Military Police Company

Support Command
HQ & HQ Company
225th Support Battalion
325th Support Battalion
725th Support Battalion
71st Chemical Company

556th Personal Services Battalion
Division Band
Division HQ &HQ Company

Notes:
(1)Stationed at Fort Lewis Washington
(2)Assigned 08/16/95 to 09/16/00
(3)Assigned 03/16/02
(4)Assigned 07/16/02
(5)Assigned 05/16/02
(6)Assigned 06/16/02
(7)Assigned 01/16/02
(8)Assigned 09/16/02
(9) Co. A, inactivated 06/16/02

2005-PRESENT
25th INFANTRY DIVISION (Modular Force)
Note: For an explanation of the modular force concept and details on the reorganization see Reorganization of the 25th Infantry Division.

1st Brigade Combat Team (Stryker)
Hq & Hq Co.
1st Battalion, 5th Infantry
3rd Battalion, 21st Infantry
1st Battalion, 24th Infantry
Co. D (Anti-Tank), 52nd Infantry
2nd Squadron, 14th Cavalry (5)
5th Squadron, 1st Cavalry (6)
2nd Battalion, 8th Field Artillery
25th Support Battalion
73rd Engineer Co.
184th Military Intelligence Co.
176th Signal Co.

2nd Brigade Combat Team (Stryker)
Hq & Hq Co.
1st Battalion, 14th Infantry
1st Battalion, 21st Infantry
1st Battalion, 27th Infantry
Co. B (Anti-Tank), 52nd Infantry
5th Squadron, 14th Cavalry (7)
2nd Squadron, 14th Cavalry (8)
2nd Battalion, 11th Field Artillery
225th Support Battalion
66th Engineer Co.
185th Military Intelligence Co.
556th Signal Co.

3rd Brigade Combat Team (Infantry)
Headquarters
2nd Battalion, 27th Infantry
2nd Battalion, 35th Infantry
3rd Squadron, 4th Cavalry
3rd Battalion, 7th Field Artillery
Special Troops Battalion, 3rd Brigade
325th Support Battalion

4th Brigade Combat Team (Airborne)
Headquarters
1st Battalion, 501st Infantry
3rd Battalion, 509th Infantry
1st Squadron, 40th Cavalry
2nd Battalion, 377th Field Artillery
Special Troops Battalion, 4th Brigade
167th Support Battalion (3)
725th Support Battalion (4)

Combat Aviation Brigade
Hq & Hq Co.
2nd Squadron (Rcn/Atk), 6th Cavalry (1)
6th Squadron (Rcn/Atk), 17th Cavalry (10)
1st Battalion (Rcn/Atk), 25 Aviation (2)
2nd Battalion (Assault), 25th Aviation
3rd Battalion (GS), 25th Aviation
209th Support Battalion (Avn)

Hq & Hq Battalion 25th Infantry Div. (11)
Hq & Support Co.
Operations Co.
Intel & Sustainment Co.
Signal Co.
Division Band (Attached)

Special Troops Battalion, 25th Infantry Division (9)

Notes
(1) Activated 6 June 2006
(2) Inactivated 6 June 2006
(3) Inactivated 15 Sep 2006
(4) Assigned 16 Sep 2006
(5) Transferred to 2nd BCT 16 Dec 06
(6) Assigned 16 Dec 06
(7) Inactivated 15 Dec 06
(8) Assigned 16 Dec 06
(9) Inactivated 15 Jan 10
(10) Attached to 16th Combat Aviation Brigade, Fort Wainwright AK
(11) Div HQ reorganized on 16 Jan 10 with assets of Spec Trps Bn