21st Infantry Regiment (United States)

The 21st Infantry Regiment ("Gimlet" ) is a United States Army infantry regiment.

Lineage

 * Constituted 3 May 1861 in the Regular Army as the 2nd Battalion, 12th Infantry
 * Organized 20 May 1862 at Fort Hamilton, New York
 * Reorganized and redesignated 7 December 1866 as the 21st Infantry
 * Consolidated 9–31 August 1869 with the 32nd Infantry (see ANNEX) and consolidated unit designated as the 21st Infantry
 * Assigned 29 July 1918 to the 16th Division
 * Relieved 8 March 1919 from assignment to the 16th Division
 * Assigned 22 October 1921 to the Hawaiian Division (later redesignated as the 24th Infantry Division)
 * Relieved 5 June 1958 from assignment to the 24th Infantry Division and reorganized as a parent regiment under the Combat Arms Regimental System
 * Withdrawn 16 January 1986 from the Combat Arms Regimental System and reorganized under the United States Army Regimental System

Annex

 * Constituted 3 May 1861 in the Regular Army as the 3d Battalion, 14th Infantry
 * Organized 27 July 1865 at Fort Trumbull, Connecticut
 * Reorganized and redesignated 21 September 1866 as the 32d Infantry
 * Consolidated 9–31 August 1869 with the 21st Infantry and consolidated unit designated as the 21st Infantry

Campaign participation credit

 * Civil War: Peninsula; Manassas; Antietam; Fredericksburg; Chancellorsville; Gettysburg; Wilderness; Spotsylvania; Cold Harbor; Petersburg; Virginia 1862; Virginia 1863
 * Indian Wars: Modocs; Nez Perces; Bannocks; Arizona 1866; Arizona 1867; Arizona 1868; Arizona 1869; Arizona 1870
 * War with Spain: Santiago
 * Philippine–American War: Zapote River; Luzon 1899; Luzon 1901; Luzon 1902
 * World War II: Central Pacific; New Guinea (with arrowhead); Leyte; Luzon; Southern Philippines (with arrowhead)
 * Korean War: UN Defensive; UN Offensive; CCF Intervention; First UN Counteroffensive; CCF Spring Offensive; UN Summer-Fall Offensive; Second Korean Winter; Korea, Summer 1953
 * Vietnam: Counteroffensive, Phase II; Counteroffensive, Phase III; Tet Counteroffensive; Counteroffensive, Phase IV; Counteroffensive, Phase V; Counteroffensive, Phase VI; Tet 69/Counteroffensive; Summer-Fall 1969; Winter-Spring 1970; Sanctuary Counteroffensive; Counteroffensive, Phase VII; Consolidation I; Consolidation II; Cease-Fire
 * Armed Forces Expeditions: Panama
 * Operation Uphold Democracy, Port-au-Prince, Haiti, 1995
 * Operation Iraqi Freedom and Enduring Freedom (Afghanistan), Global War on Terrorism

Decorations

 * Valorous Unit Award for OIF 3 August–October 2004-2005
 * Presidential Unit Citation (Army) for DEFENSE OF KOREA
 * Presidential Unit Citation (Army) for SANGHONGJONG-NI
 * Valorous Unit Award for TAM KY - TIEN PHUOC
 * Navy Unit Commendation for CAM LO
 * Philippine Presidential Unit Citation for 17 OCTOBER 1944 TO 4 JULY 1945
 * Republic of Korea Presidential Unit Citation for PYONGTAEK
 * Republic of Korea Presidential Unit Citation for KOREA