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| First U.S. Army | |
|---|---|
| Unit name | First U.S. Army |
| Caption | Shoulder sleeve insignia |
| Active dates | 1918–present |
| Country | United States |
| Branch | United States Army |
| Type | Field army |
| Role | Training and mobilization |
| Garrison | Fort Knox |
| Notable commanders | John J. Pershing, George S. Patton, Omar Bradley |
First U.S. Army First U.S. Army is a numbered field army of the United States Army with origins in World War I, prominent roles in World War II, and continuing responsibilities for training, mobilization, and readiness into the 21st century, interacting with organizations such as U.S. Northern Command, U.S. Army Forces Command, National Guard Bureau, Department of Defense, and multinational partners including NATO and the United Nations.
First U.S. Army traces its activation to the American Expeditionary Forces under General John J. Pershing during World War I, followed by reorganization under leaders like Hunter Liggett and transitions through the interwar period involving Army Service Forces reforms, the National Defense Act, and training doctrine influenced by figures such as Fox Conner and institutions like the Infantry School at Fort Benning. During World War II the army reconstituted under commanders including Omar Bradley and executed campaigns connected to the Normandy Campaign, the Northern France Campaign, and coordination with formations such as Third Army and Ninth Army while interacting with Allied leaders like Dwight D. Eisenhower, Bernard Montgomery, Georgy Zhukov, and Charles de Gaulle. In the Cold War era First Army shifted roles amid NATO force posture, continental defense planning with Continental Air Defense Command, and mobilization responsibilities influenced by crises like the Korean War, the Berlin Crisis of 1961, and the Cuban Missile Crisis. During the Vietnam War era and the post‑Vietnam restructuring the army engaged with U.S. Army Training and Doctrine Command initiatives and reserve component integration involving the Army Reserve and Army National Guard. Since the 1990s First Army's mission evolved to support homeland defense under U.S. Northern Command and force generation for operations such as Operation Desert Storm, Operation Iraqi Freedom, and Operation Enduring Freedom, and to coordinate exercises with partners including Canada, Mexico, United Kingdom, and multinational coalitions under frameworks like Partnership for Peace.
First Army's headquarters structure has varied, incorporating commands and subordinate elements such as numbered corps, training divisions, mobilization brigades, and support commands; historic subordinate formations include I Corps (United States), II Corps (United States), VIII Corps (United States), and training entities like 1st Training Brigade (United States), 2nd Infantry Division (United States), and the U.S. Army Reserve Command. Staff functions align with U.S. Army Forces Command doctrine and joint staffs such as Joint Task Force staffs, integrating capabilities from the Army National Guard, the U.S. Army Reserve, and Defense agencies including the Defense Logistics Agency and National Guard Bureau for mobilization, sustainment, personnel management (G1), operations (G3), intelligence (G2), and logistics (G4). Command relationships have linked First Army to geographic commands like Forces Command and joint structures like U.S. Northern Command, with administrative support from posts including Fort Knox, Fort McPherson, and historically Camp Meade.
Activated within the American Expeditionary Forces in 1918, First Army conducted operations on the Western Front during the Second Battle of the Marne, the Aisne-Marne Offensive, and the Meuse-Argonne Offensive, coordinating with Allied armies such as the British Expeditionary Force, the French Fourth Army, and the Belgian Army. Commanded by leaders including John J. Pershing and Robert Bullard, the army deployed corps-level formations like I Corps (United States) and IV Corps (United States), integrating units such as the 1st Division (United States), the 2nd Division (United States), and the 42nd Infantry Division (United States), and working with logistics and medical services from organizations like the American Red Cross and the Army Medical Corps to sustain offensives and demobilization through armistice and the Treaty of Versailles aftermath.
Reactivated and expanded for World War II, First Army, under commanders such as Omar Bradley and subordinate to 12th Army Group, played a central role in the Normandy landings, the subsequent breakout during Operation Cobra, the Battle of the Falaise Pocket, and the advance across France into the Rhineland Campaign, coordinating with formations including Third Army (United States), Ninth Army (United States), and Allied commanders Bernard Montgomery and George S. Patton. First Army oversaw corps-level operations with V Corps (United States), VII Corps (United States), and VIII Corps (United States), and interacted with logistics efforts from Army Service Forces, engineering units like the U.S. Army Corps of Engineers, and air support from the U.S. Army Air Forces and Royal Air Force for interdiction, close air support, and airborne operations such as those involving the 101st Airborne Division (United States) and the 82nd Airborne Division (United States). Postwar occupation duties involved coordination with Allied-occupied Germany authorities and demobilization under policies shaped by the G.I. Bill and War Department directives.
In the Cold War period First Army adapted to continental defense and mobilization roles amid tensions exemplified by the Korean War, the Berlin Crisis of 1961, and the Cuban Missile Crisis, interfacing with Strategic Air Command planning and continental systems like NORAD. Elements of First Army supported mobilization of reserve component units for deployments to Korea and for NATO reinforcement plans in coordination with Supreme Headquarters Allied Powers Europe and U.S. theater commands. Organizational changes reflected broader reforms instituted by Secretary of Defense Robert McNamara and later by the Goldwater-Nichols Act, with shifts toward joint interoperability and reserve integration affecting training, readiness reporting, and mobilization timelines.
During the Vietnam War era First Army's stateside responsibilities included force generation, training oversight, and mobilization support for units destined for South Vietnam, working with centers such as Fort Benning, Fort Bragg, and Fort Hood and educational institutions like the Command and General Staff College. Post‑Vietnam restructuring emphasized reserve component modernization, readiness metrics, and the incorporation of lessons from operations such as Operation Lam Son 719 and the Tet Offensive into doctrine promulgated by U.S. Army Training and Doctrine Command and reflected in training programs for infantry, armor, and aviation branches.
Since the end of the Cold War First Army has prioritized mobilization, predeployment training, homeland defense, and support to operations including Operation Desert Shield, Operation Desert Storm, Operation Iraqi Freedom, and Operation Enduring Freedom, collaborating with joint and coalition partners such as U.S. Central Command, Coalition Forces Land Component Command, NATO Training Mission-Afghanistan, and partner militaries from United Kingdom, Canada, and Australia. First Army-led initiatives have encompassed Mobilization Assistance Programs, Joint Readiness Training Center rotations with Fort Polk and the National Training Center at Fort Irwin, collaborative exercises under NATO Partnership for Peace, and disaster response coordination with agencies like the Federal Emergency Management Agency during events including Hurricane Katrina and Hurricane Sandy. Contemporary priorities include cyber and multi-domain readiness aligned with U.S. Cyber Command and modernization efforts tied to programs from Army Futures Command and force structure adjustments responding to strategic guidance from the National Defense Strategy.