The Distinctive Unit Insignia (DUI), or unit crest, of the 302nd Support Battalion was originally approved for the 2nd Medical Regiment on 12 March 1924. It was subsequently redesignated for the 2nd Medical Battalion on 26 February 1940 and for the 302nd Support Battalion on 16 October 1989. It was also worn by personnel in the 302nd Brigade Support Battalion, 1st Heavy Brigade Combat Team, 2nd Infantry Division, Eighth United States Army beginning in 2005 (see below).
Maroon and white are Medical Corps colors and are used here to reflect the unit’s branch designation at the time the insignia was approved. In the center of the maroon shield is a cross with arms terminating in fleurs-de-lis, representing 2nd Medical Regiment’s service in France during World War I. A green Geneva cross was the first shoulder patch worn by the 2nd Sanitary Train in France, also during World War I.
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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For the first ninety-five years of its existence, the unit that was eventually designated as the 302nd Brigade Support Battalion served as a Medical organization of one type or another, starting with its original incarnation as the School of Instruction Hospital Corps, Washington Barracks Washington D.C. in 1894. During first World War I, it was a component in the 2nd Sanitary Train, 2nd Infantry Division and remained overseas following the signing of the Armistice as part of the Army of Occupation. By the time it landed on Omaha Beach on 7 June 1944, it had been redesignated as the 2nd Medical Battalion but was a part of the 2nd Infantry Division. In all, the Battalion participated in two dozen battles in France and other parts of Europe, earning battle streamers for five the War’s named campaigns. In 1950, the Battalion made its first deployment to Korea with the 2nd Infantry Division, returning home in early 1954.
The battalion participated in the Korean Conflict from 1950 through the early part of 1954, again in support of the 2nd Infantry Division. It underwent a major reorganization in June 1958 at Fort Benning (nown known as Fort Moore) in Georgia, where it received personnel and equipment from 10th Infantry Division as it was being deactivated. But its Medical service came to an end in October 1989 with its reorganization and redesignation as the 302nd Forward Support Battalion and assignment to the 1st Brigade Combat Team, 2nd Infantry Division on Camp Casey in Korea. On 15 April 2005, the battalion was officially redesignated as the 302D Brigade Support Battalion supporting the newly designated 1st Heavy Brigade Combat Team (BCT), 2nd Infantry Division.
The 302nd Brigade Support Battalion was inactivated some time in the latter half of 2012 or the first half of 2013 while still stationed on Camp Casey.