Constituted 3 May 1861 in the Regular Army as the 2d Battalion, 11th Infantry

Organized 6 June 1862 at Fort Independence, Massachusetts

Reorganized and redesignated 6 December 1866 as the 20th Infantry

Assigned 9 July 1918 to the 10th Division

Relieved 14 February 1919 from assignment to the 10th Division

Assigned 18 September 1920 to the 2d Division

Relieved 16 October 1939 from assignment to the 2d Division and assigned to the 6th Division (later redesignated as the 6th Infantry Division)

Inactivated 10 January 1949 in Korea

Activated 4 October 1950 at Fort Ord, California

Relieved 3 April 1956 from assignment to the 6th Infantry Division

Reorganized 15 November 1957 as a parent regiment under the Combat Arms Regimental System

Withdrawn 16 August 1986 from the Combat Arms Regimental System and reorganized under the United States Army Regimental System

20th Infantry Honors

Campaign Participation Credit

Civil War: Peninsula; Manassas; Antietam; Fredericksburg; Chancellorsville; Gettysburg; Wilderness; Spotsylvania; Cold Harbor; Petersburg; Virginia 1862; Virginia 1863

Indian Wars: Little Big Horn; Pine Ridge

War with Spain: Santiago

Philippine Insurrection: Manila; Luzon 1901

World War II: New Guinea; Luzon (with arrowhead)

Vietnam: 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

Decorations

Presidential Unit Citation (Army) for MAFFIN BAY

Presidential Unit Citation (Army) for CABARUAN HILLS

Presidential Unit Citation (Army) for MUNOZ

Meritorious Unit Commendation (Army) for VIETNAM 1972

Philippine Presidential Unit Citation for 17 OCTOBER 1944 TO 4 JULY 1945