United States Army Armored Force

United States Army Armored Force
Unit name	United States Army Armored Force
Caption	M4 Sherman of the United States Army during the Battle of the Bulge
Dates	July 1940 – July 1943
Country	United States
Branch	United States Army
Type	Armored force
Role	Armored warfare, mobile operations
Garrison	Fort Knox
Notable commanders	Adna R. Chaffee Jr., Lesley J. McNair

United States Army Armored Force was the principal armored arm of the United States Army established in 1940 to develop, equip, and employ armored formations during World War II. It centralized doctrine, training, and procurement for armored units and influenced campaigns in the North African Campaign, Italian Campaign, and the Western Front (World War II). The Armored Force bridged prewar mechanization experiments and postwar armored branches, shaping US armored doctrine and combined arms practices.

Origins and Formation

The Armored Force emerged from interwar experiments at Fort Knox, influences from the Royal Armoured Corps, and studies by officers attached to the German Army and French Army after World War I. Key advocates included Adna R. Chaffee Jr. and Lesley J. McNair, whose reports to the War Department and collaboration with the Ordnance Department and General Staff accelerated creation of a centralized armored organization. The establishment followed reorganizations like the 1920s Tank Corps (United States Army) and responded to lessons from the Spanish Civil War, Battle of France, and maneuvers such as the Louisiana Maneuvers and the Carolina Maneuvers that emphasized mobility and combined arms. The Armored Force was officially activated in July 1940 under the command of proponents who linked mechanized cavalry traditions from the United States Cavalry to modern armored warfare concepts.

Organization and Structure

The Armored Force standardized formations such as armored divisions, tank battalions, and combat commands, integrating assets from the Infantry Branch and the Field Artillery Branch. Divisional structure evolved from early heavy and light categorizations to the more flexible "combined arms team" model used by units like the 2nd Armored Division and the 3rd Armored Division. Higher headquarters included the Armored Force School at Fort Knox and administrative elements at the Army Ground Forces. The Armored Force coordinated with the Air Corps for close air support, the Corps and Army Groups for operational employment, and liaison with the Office of Strategic Services for reconnaissance integration. Command relationships changed as the European Theater of Operations, United States Army and Mediterranean Theater of Operations required corps-level armored task forces and mixed infantry-armor formations.

Equipment and Vehicles

Procurement prioritized tanks, personnel carriers, and armored reconnaissance vehicles procured and developed by the Ordnance Department and produced by firms like General Motors, Chrysler, Ford Motor Company, and Baldwin Locomotive Works. Iconic systems included the M4 Sherman, M3 Lee, M5 Stuart, and tank destroyer conversions like the M10 tank destroyer and M18 Hellcat. Armored force logistics relied on vehicles such as the M3 Half-track, M2 Half-track, and engineering vehicles adapted from Caterpillar Tractor Company chassis. Armament sources included guns such as the 75 mm gun M3 and the 76 mm gun M1, and anti-tank measures integrated ordnance like the M1 Bazooka. Night-fighting and communication improvements came from collaboration with the Signal Corps and naval radar developments by Radiation Laboratory (MIT) affiliates.

Training and Doctrine

Doctrine synthesized lessons from the British Expeditionary Force, Soviet Deep Battle, and armored thinkers like proponents of mechanized maneuver within the General Headquarters (GHQ). The Armored Force School at Fort Knox centralized training programs, officer courses, and armored tactics development, while replacement training centers such as Camp Polk and Camp Bowie processed personnel. Training stressed combined arms teamwork with Infantry Branch units, coordination with Field Artillery Branch units, and integration of engineers from the Corps of Engineers. Wargaming at the Army War College and model testing at the Aberdeen Proving Ground influenced doctrine papers and tactical manuals distributed to units including the 1st Armored Division and Patton's Third Army. Officers studied campaigns like Operation Torch, Kasserine Pass, and Operation Husky to refine doctrine on exploitation, reconnaissance, and anti-tank defense.

Combat Operations and Campaigns

Armored Force units participated in major operations across multiple theaters. In the North African Campaign armored divisions spearheaded assaults during Operation Torch and faced Axis counterattacks at Kasserine Pass, prompting tactical revisions. In the Sicily Campaign and the Italian Campaign armor supported infantry in rugged terrain during battles such as Anzio and the Gothic Line. On the Western Front (World War II) armored forces under commanders like George S. Patton executed rapid advances in Operation Overlord follow-ons, the Battle of the Bulge, and the Rhineland Campaign. Armored reconnaissance elements engaged German panzer units including formations from the Heer and faced armored threats including the Panzerkampfwagen V Panther and Panzerkampfwagen VI Tiger. Coordination with Allied formations such as the British Eighth Army and the French First Army showcased combined Allied armored warfare.

Postwar Evolution and Legacy

After 1943 the Armored Force's functions were absorbed into broader branch structures, influencing the postwar establishment of the Armor Branch (United States Army) and shaping Cold War armored doctrine used by units in NATO and garrisoned at bases like Fort Hood and Fort Knox. Lessons from the Armored Force informed armored vehicle development projects like the M48 Patton and later programs culminating in the M1 Abrams through doctrinal continuities in the Combat Arms Regimental System and training at the Armor School. The Armored Force's legacy persists in armored tactics taught at the United States Army Combined Arms Center, commemorated by museums including the National Armor and Cavalry Museum, and remembered in campaign honors and unit histories of divisions such as the 4th Armored Division and 7th Armored Division.

Category:United States Army forces Category:Armored warfare