Third United States Infantry

Third United States Infantry

The Third United States Infantry is a long-established regular Army regiment with service dating to the early 19th century, participating in major American conflicts from the War of 1812 through the Global War on Terror. Its lineage intersects with campaigns, garrison duties, and organizational reforms that involved the War Department, the Army Staff, the Department of the Missouri, and later the Department of the Army during periods of mobilization and demobilization.

History

The regiment traces origins to the post-War of 1812 reorganization under Secretary of War supervision and was active during the Mexican–American War with detachments under commanders engaged at Battle of Monterrey and Battle of Buena Vista. During the American Civil War elements served in both western and eastern theaters, operating alongside formations of the Army of the Potomac and the Army of the Tennessee and participating in operations connected to the Overland Campaign and the Vicksburg Campaign. In the late 19th century the regiment deployed to the Philippine–American War and took part in occupations after the Spanish–American War in tandem with units from the United States Volunteers and the Regular Army. In the 20th century the regiment expanded and contracted through the National Defense Act of 1916 and served in World War I assignments within expeditionary forces attached to the American Expeditionary Forces as well as in World War II campaigns in both European and Pacific theaters, later providing infantry battalions in Korean War operations and advisory roles during the Vietnam War. Post-Cold War realignments saw the regiment involved in Operation Desert Shield, Operation Desert Storm, and rotations under Operation Enduring Freedom and Operation Iraqi Freedom.

Organization and Structure

Organizationally the regiment has been constituted as companies, battalions, and regimental headquarters under tables of organization issued by the War Department and later by the Department of the Army. Its companies have been assigned to brigade combat teams aligned with divisional headquarters such as the 1st Infantry Division, 3rd Infantry Division, and other commands including the XVIII Airborne Corps and the Eighth United States Army during foreign deployments. The regiment's internal structure reflected transitions from line infantry to light infantry and mechanized variants, integrating assets from the Ordnance Corps, Signal Corps, Quartermaster Corps, and close coordination with Field Artillery regiments and Engineer battalions for combined-arms operations. Command, control, communications, computers, intelligence, surveillance, and reconnaissance functions were synchronized with directives from the Joint Chiefs of Staff during joint operations with United States Marine Corps and allied formations such as United Kingdom Armed Forces and Republic of Korea Armed Forces.

Campaigns and Deployments

Deployments include early 19th-century frontier garrison duties at posts along the Mississippi River and the Great Lakes, expeditionary service during the Mexican War to campaign sites in Nuevo León and Coahuila, Civil War operations across Virginia and the Western Theater, and late 19th-century actions during the Indian Wars in coordination with units from the Buffalo Soldiers regiments. During World War I the regiment’s personnel were integrated into divisions preparing for the Meuse-Argonne Offensive under General John J. Pershing. In World War II soldiers fought in theaters tied to campaigns such as the Normandy landings, the Rhineland Campaign, or island operations in the Pacific Theater contingent on battalion assignment. Korean War engagements included frontline rotations along the 38th Parallel and defense of positions later formalized in armistice negotiations at Panmunjom. In Vietnam, elements engaged in counterinsurgency operations in provinces coordinated with Military Assistance Command, Vietnam logistics. Modern deployments to Saudi Arabia, Kuwait, Iraq, and Afghanistan involved joint operations, stability tasks, and base defense, supporting multinational coalitions and partnering with forces like the NATO contingents.

Honors and Decorations

The regiment and its subordinate units have received unit-level citations including the Presidential Unit Citation for distinguished combat actions, the Valorous Unit Award for extraordinary heroism, and the Meritorious Unit Commendation for sustained superior performance. Individual Soldiers from the regiment have been awarded the Medal of Honor for acts during conflicts such as the Philippine–American War and World War II. Campaign streamers reflecting service in named operations such as the Peninsula Campaign, Antietam, Normandy, and modern campaigns like Iraq Campaign and Afghanistan Campaign are part of the regiment’s colors.

Notable Commanders and Personnel

Prominent leaders and personnel associated through command, staff, or distinguished service include officers who later rose to high rank and served on the Joint Chiefs of Staff or as corps and division commanders in the European Command and United States Army Pacific. Other notable figures served as regimental commanders during pivotal battles and included recipients of high decorations such as the Distinguished Service Cross and the Silver Star for gallantry. The regiment’s veterans have included participants in national ceremonies at sites like Arlington National Cemetery and contributors to doctrine development at institutions including the United States Military Academy and the National War College.

Category:United States Army regiments Category:Infantry regiments of the United States Army