The 108th Armored Regiment Distinctive Unit Insignia was approved on 30 March 1971. Yellow and green are featured prominently in the palette because they are associated with Armored units; green was one of the colors assigned to Armor in February 1947, replaced by yellow in 1951 after the Cavalry branch was abolished. The red background combined with the blue, fimbriated (thinly bordered) saltire were inspired by the state flag of Georgia (the gold border is suggested by gold charges inside the canton of the flag). A gauntlet symbolizes power and the crushing effectiveness of Armored units. The unit motto, “Strike Swiftly,” strengthens the imagery of the gauntleted hand by introducing the element of speed that makes Armored units so powerful.
Full guidance on wear of the DUI is found in DA Pamphlet 670-1, Section 21-22, "Distinctive unit insignia" and 21–3(d) and (e), "Beret" and "Garrison Cap," respectively.
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Originally constituted on 19 June 1959 19 June 1959 in the Georgia Army National Guard as the 108th Armor, a parent regiment in the Combat Arms Regimental System (CARS), it was organized the following month to consist of three Medium tank battalions (2nd, 3rd, and 4th) and the 1st Reconnaissance Squadron, all elements of the 48th Armored Division. It was reorganized in 1962 with the addition of the 5th Medium Tank Battalion, and the following year the 1st Reconnaissance Squadron was replaced by the 1st Medium Tank Battalion, with all five battalions still elements of the 48th Infantry Division.
In January 1968, the Regiment was downsized to consist of a single battalion, the 1st, that was an element of the 30th Infantry Division; in December 1973, the 1st Battalion was made an element of the 48th Infantry Division. Withdrawn from CARS in 1989 and reorganized under the U.S. Army Regimental System with its HQ at Calhoun, the Regiment was ordered in to active Federal Service on 20 November 1990 (at home stations) and released from said service on 27 March 1991. It was again called into active Federal service at home stations on 6 December 2004 to 3 January 2005, and released from active Federal service between 1 September to 1 October 2006.
The unit had been redesignated as the 108th Armored Regiment on 1 October 2005, but a month shy of two years later the service life of the 108th Armored Regiment came to a close as it was consolidated with the 108th Cavalry Regiment, with the new unit being retaining the old 108th Cavalry DUI that had been approved in 1996.