Divisional Organization

The 90th Infantry Division during WWII was organized along the lines of the standard US Army 'Triangular' Division Structure.
This structure, which employed the use of 3 Infantry Regiments, as opposed to the 4 of the WWI 'Square' division along with the elimination of the Brigade level command, which also was a component of the WWI 'Square' divisional structure, served to create a more flexible divisional structure that was better suited to the rapid and mobile conflict that the US Army anticipated WWII to be.

The Divisional Structure of the 90th Infantry Division in WWII is as follows:

Infantry Regiments:
- 357th Infantry Regiment
- 358th Infantry Regiment
- 359th Infantry Regiment

Field Artillery Battalions:
- 343rd Field Artillery Battalion
- 344th Field Artillery Battalion
- 915th Field Artillery Battalion
- 345th Field Artillery Battalion

Divisional Troops:
- 90th Reconnaissance Troop (Mech)
- 315th Engineer Combat Battalion
- 315th Medical Battalion
- 790th Ordnance Light Maintenance Company
- 90th Quartermaster Company
- 90th Signal Company
- Headquarters Company
- Military Police Platoon
- Divisional Band

In addition to the Organic composition of the 90th Infantry Divisions, the rapid and fluid nature of combat during WWII necessitated the attachment non organic elements to the 90th Infantry Division to better achieve its objectives and the detachment of elements of the 90th Infantry Division to other organizations to meet the extrigencies of combat.

Units attached and detached from the 90th are as follows:

Attachments:

Antiaircraft Artillery:
- 537th AAA Automatic Weapons Bn (Mbl) - June 16th through July 7th, 1944
- 1st Battery, 537th AAA Automatic Weapons Bn (Mbl) - July 7th through July 15th, 1944
- 537th AAA Automatic Weapons Bn (Mbl) - July 15th, 1944 through May 26th, 1945
- Battery B, 217th AAA Gun Bn (Mbl) - February 5th through 6th, 1945

Armored Units:
- 746th Tank Bn - June 12th through 15th, 1944
- 712th Tank Bn - June 28th through July 7th, 1944
- A Co, 712th Tank Bn - July 7th through 15th, 1944
- 1 CC French 2nd Armored Division - August 18th through 22nd, 1944
- 17th Tank Bn (7th Armored Division) - September 9th through 14th, 1944

Cavalry Units:
- B Troop, 4th Cavalry Recon Squadron - June 20th through 29th, 1944
- B Troop, 43rd Cavalry Recon Squadron - September 7th through 11th, 1944
- French Group Tactique Lorraine - October 12th through 13th, 1944
- Task Force Polk (3rd Cavalry Group) - October 12th through November 9th, 1944
- Hq and Hq Troop, 3rd Cavalry Group - October 12th through November 9th, 1944
- 3rd Cavalry Recon Squadron - October 12th through November 9th, 1944
- 43rd Cavalry Recon Squadron - October 12th through November 9th, 1944
- 3rd Cavalry Group (reinforced) - December 20th, 1944 through January 6th, 1945
- 2nd Cavalry Group - March 17th through 24th, 1945

Chemical Warfare Units:
- A Co, 86th Chemical Mortar Bn - June 28th through July 29th, 1944
- C Co, 86th Chemical Mortar Bn - July 1st, 1944
- D Co, 86th Chemical Mortar Bn - July 4th through 6th, 1944
- C & D Cos, 81st Chemical Mortar Bn - August 20th through 22nd, 1944
- C Co, 81st Chemical Mortar Bn - November 13th, 1944 through January 6th, 1945
- B Co, 81st Chemical Mortar Bn - December 11th, 1944 through January 6th, 1945
- C Co, 3rd Chemical Mortar Bn - January 11th through 18th, 1945
- D Co, 3rd Chemical Mortar Bn - January 13th through 25th, 1945
- 161st Chemical Signal Co - March 6th through 10th, 1945
- C Co, 91st Chemical Mortar Bn - March 11th through April 14th, 1945
- 2 sections of 84th Chemical Signal Co - March 11th through 22nd, 1945
- 161st Chemical Signal Co - March 22nd through 26th, 1945
- A Co, 97th Chemical Mortar Bn - April 14th through 16th, 1945

Engineer Units:
- 148th Engineer Combat Bn - June 21st through 22nd, 1944
- 135th Engineer Combat Bn - November 9th through December 21st, 1944
- 44th Engineer Combat Bn - March 4th through 6th, 1945
- 35th Engineer Combat Bn - March 4th through 10th, 1945

Field Artillery Units:
- 980th Field Artillery Bn (155 Gun) - June 13th through 14th, 1944
- 4th Divisional Artillery - June 28th through July 6th, 1944
- 693rd Field Artillery Bn (105 How) - July 31st through August 17th, 1944
- 400th Armored Field Artillery Bn - August 3rd through 5th, 1944
- 202nd Field Artillery Bn (155 How) - August 3rd through 5th, 1944
- 40th Field Artillery Group - August 4th through 17th, 1944
- 173rd Field Artillery Group - August 4th through 17th, 1944
- B Battery, 3rd Field Observation Bn - August 4th through 17th, 1944
- 999th Field Artillery Bn (8" How) - August 9th through 17th, 1944
- 284th Field Artillery Bn (105 How) - August 27th through 30th, 1944
- 282nd Field Artillery Bn (105 How) - September 5th through 17th, 1944
- 282nd Field Artillery Bn (105 How) - September 23rd through October 2nd, 1944
- 241st Field Artillery Bn (105 How) - November 8th through 14th, 1944
- C Battery, 558th Field Artillery Bn (155 Gun) - November 11th through 16th, 1944
- C Battery, 558th Field Artillery Bn (155 Gun) - December 4th through 21st, 1944
- 241st Field Artillery Bn (105 How) - December 4th, 1944 through January 6th, 1945
- 282nd Field Artillery Bn (105 How) - December 30th, 1944 through January 1st, 1945
- 949th Field Artillery Bn (155 How) - January 11th, 1944 through February 11th, 1945
- 274th Armored Field Artillery Bn - January 27th through February 24th, 1945
- A Battery, 174th Field Artillery Bn (155 Gun) - January 29th through February 24th, 1945
- 771st Field Artillery Bn (4.5" Gun) - February 15th through 21st, 1945

Tank Destroyer Units:
- B Co, 899th Tank Destroyer Bn, Self-Propelled - June 17th through 19th, 1944
- 607th Tank Destroyer Bn ( minus A Co), Towed - June 20th through November 2nd, 1944
- 803rd Tank Destroyer Bn, Self-Propelled - July 4th through 15th, 1944
- A Co, 607th Tank Destroyer Bn, Towed - July 7th, through November 2nd, 1944
- 773rd Tank Destroyer Bn, Self-Propelled - November 2nd, 1944 through May 9th, 1945
- 607th Tank Destroyer Bn, Towed - November 20th through 27th, 1944
- 807th Tank Destroyer Bn - December 20th through 24th, 1944
- 774th Tank Destroyer Bn, Towed - December 31st, 1944 through January 6th, 1945

Detachments:

Field Artillery Units:
- 915th Field Artillery Bn to 9th Infantry Division - June 15th through July 17th, 1944

Infantry Units:
- 359th Infantry Regiment ( minus 2nd Bn) to 4th Infantry Division - June 6th through 10th, 1944
- 359th Infantry Regiment to 9th Infantry Division - June 16th through 17th, 1944
- 1st Bn, 359th Infantry Regiment to 9th Infantry division - June 20th through 21st, 1944
- 357th Infantry Regiment to 5th Infantry Division - March 23rd through 24th, 1945
- 1st Bn, 357th Infantry Regiment to XII Corps - April 8th through 17th, 1945

For information on the differing types of units please see our page on the T/O & E's of Regiments, Battalions and Companies:

T/O & E's

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