The 124th Regiment Distinctive Unit Insignia, commonly referred to as a DUI or a “unit crest,” was originally approved for the 124th Antiaircraft Artillery Battalion on 21 April 1953. It was cancelled on 8 September 1961, but was reinstated and redesignated for the 124th Regiment with revised description and symbolism on 20 May 1997, the same date that the Vermont National Guard's Regional Training was designated as the 124th Regiment.
In military heraldry, the battle-axe is commonly used as a symbol of wartime service in Europe because it was a favored weapon of Teutonic forces and commonly used in medieval heraldry; here it commemorates the 124th Antiaircraft Artillery’s participation in the Rhineland campaign of World War II. A gold lion on a black field is taken from the arms of Bavaria and symbolizes the Central Europe campaign, much of which centered around the large province in Southern Germany. VIRIDIMONTES DEFENDEMUS, the unit motto, is Latin for “We Defend The Green Mountains,” a reference to the “Green Mountain” state of Vermont which in turn inspired the nickname “Green Mountain Boys,” which was first used in the Revolutionary War by the Vermont militia led by Ethan Allen and which today refers to the Vermont Army National Guard as a whole.
A major command in the Vermont Army National Guard, the 124th Regional Training Institute is comprises the 124th Regiment Headquarters, the Army Mountain Warfare School, and three of the Regiment's Battalions: 2nd Modular Training Battalion, 3rd Information Operations Battalion, and the 4th Signal Training Battalion.
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Distinctive Unit Insignias are worn by all Soldiers (except General Officers) in units that have been authorized to be issued the device. It is worn centered on the shoulder loops of the Army Green Service Uniform (AGSU) and the blue Army Service Uniform (ASU, Enlisted only) with the base of the insignia toward the outside shoulder seam. DUIs are not worn on the Dress variations of either uniform, however.