25th Infantry Regiment

25th Infantry Regiment
Unit name	25th Infantry Regiment
Dates	1869–present
Country	United States
Branch	United States Army
Type	Infantry
Role	Light infantry, garrison, expeditionary operations
Size	Regiment
Garrison	Fort Riley

25th Infantry Regiment is a Regular Army infantry regiment of the United States Army with a lineage tracing to post‑Civil War reconstruction and continental expansion. The regiment served in multiple conflicts from the Indian Wars and the Philippine–American War through both World Wars, the Korean War, the Vietnam War, and into post‑Cold War operations, deploying to theaters associated with the Spanish–American War, Pacific campaigns, and Operation Iraqi Freedom. Its units have been assigned to divisions, posts, and theaters including Department of the Missouri, Department of the Platte, Eighth Army (United States), 25th Infantry Division (United States), and garrisons such as Fort Riley and Fort Campbell.

History

The regiment was constituted in 1869 during Reconstruction under the United States Army reorganization that followed the American Civil War and the Indian Wars, inheriting duties from earlier regiments and participating in campaigns tied to westward expansion and conflicts with tribes involved in the Great Sioux War of 1876–77 and other frontier operations. In the late 19th century it deployed to the Philippine–American War and garrisoned posts during the era of insular expansion following the Spanish–American War. During World War I the regiment provided personnel and cadre for formations preparing for American Expeditionary Forces deployments. In World War II elements served in the Pacific Theater, participating in campaigns associated with New Guinea campaign and Philippine campaign (1944–45). The regiment was a core unit in the Korean War, fighting in engagements connected to Pusan Perimeter, the Inchon landing, and the Chosin Reservoir operations alongside United Nations forces. In the Vietnam War the regiment operated in counterinsurgency and conventional operations linked to provinces and logistical hubs such as Cu Chi, Bien Hoa, and regions contested during the Tet Offensive. Post‑Cold War reassignments saw battalions attached to modular brigades and deployed for Operation Iraqi Freedom and stability operations in the Global War on Terrorism.

Organization and Structure

The regiment has historically comprised multiple battalions, each organized into rifle companies, heavy weapons companies, and support detachments aligned under battalion and regimental headquarters within formations such as the 25th Infantry Division (United States), 1st Infantry Division (United States), and various separate brigades. At different periods battalions were subordinated to posts including Fort Benning, Fort Campbell, and Schofield Barracks, reflecting doctrinal shifts toward light infantry, airborne, and mechanized task organization influenced by doctrines published by the United States Army Training and Doctrine Command, Department of the Army, and interwar analyses like those by the U.S. Army War College. Regimental administration interfaced with entities such as the Office of the Chief of Infantry and wartime commands including U.S. Army Forces Pacific and Eighth United States Army.

Campaigns and Engagements

The regiment's campaign credits span frontier actions related to the Sioux Wars, campaigns during the Philippine Insurrection, and engagements in the World War II Pacific Theater, including amphibious and jungle operations coordinated with the United States Navy and United States Marine Corps. In Korea the unit took part in major operations associated with Battle of Pusan Perimeter, UN counteroffensives, and defensive actions during Chinese intervention tied to the Chinese People's Volunteer Army. Vietnam War service included counterinsurgency, search‑and‑destroy operations, and conventional battles connected to operations like Operation Junction City and engagements during the Tet Offensive period. Later deployments in the 21st century involved expeditionary operations in Iraq War campaigns, counterinsurgency in provinces where coalition forces operated alongside units from the Multi‑National Force – Iraq and partnered with host‑nation security elements.

Training, Doctrine, and Equipment

Training rotated through institutional centers such as United States Army Infantry School at Fort Benning and regional training centers like the National Training Center (United States) and the Joint Readiness Training Center. Doctrine evolved alongside influences from publications such as the Field Manual 3-0 series and concepts developed by U.S. Army Forces Command and TRADOC, transitioning battalions between light infantry, air assault, and mechanized configurations. Equipment historically included bolt‑action and semi‑automatic small arms such as variants evolved from the Springfield Model 1903 through the M16 rifle family, crew‑served weapons like the M2 Browning and squad automatic weapons, mortars, and support vehicles including the M113 armored personnel carrier and later the Stryker and HMMWV platforms depending on battalion role. Logistic and medical support relied on doctrines for sustainment promulgated by the U.S. Army Materiel Command and corps‑level support elements.

Notable Personnel and Honors

Members of the regiment have received decorations including the Medal of Honor, Distinguished Service Cross, and unit citations such as the Presidential Unit Citation for actions in specific campaigns. Notable figures associated with the regiment have included officers and enlisted leaders who later served in senior positions within formations like the 25th Infantry Division (United States), Eighth United States Army, and in joint commands influenced by leaders educated at the United States Military Academy, United States Army War College, and National War College. Individual honorees' citations reference engagements in battles tied to the Philippine–American War, World War II, Korean War, and Vietnam War.

Insignia and Traditions

The regiment's heraldry, colors, and insignia reflect its lineage and are registered with the Institute of Heraldry (United States), incorporating symbols representing campaigns from the frontier period through Pacific and Asian theaters. Traditions include regimental marches, unit crests, and commemorations aligned with anniversaries of battles such as those linked to the Philippine Insurrection and major campaign dates recognized by the United States Army Center of Military History. Ceremonial practices draw on customs observed at posts like Schofield Barracks and during divisional events hosted by the 25th Infantry Division (United States).

Category:Infantry regiments of the United States Army