The 66th Armor Regiment is the oldest Armored unit in the United States Army, tracing its lineage to the beginning of the Tank Service in February 1918 under the command of Col. George S. Patton; it was first activated in the Regular Army as the 66th Infantry Regiment (Light Tanks).Organized in August 1918 in the American Expeditionary Forces in France as Headquarters and Headquarters Companies, 1st and 2d Provisional Brigades, Tank Corps
Redesignated 6 November 1918 as Headquarters and Headquarters Companies, 304th and 305th Brigades, Tank Corps, respectively
Campaign Participation Credit
World War I: Somme Offensive; St. Mihiel; Meuse-Argonne
World War II: Algeria-French Morocco (with arrowhead); Sicily (with arrowhead); Normandy; Northern France; Rhineland; Ardennes-Alsace; Central Europe
Korean War: UN Defensive; UN Offensive; CCF Intervention; First UN Counteroffensive; CCF Spring Offensive; UN Summer-Fall Offensive; Second Korean Winter; Korea, Summer 1953
Southwest Asia: