Inactivated 22 June 2005, the 122nd Signal Battalion was originally organized on 10 October 1916 as the 1st Field Battalion, Signal Corps, comprising three existing companies (A, B, C), one of which had taken part in the Philippine Insurrection campaign of San Isidro. The Battalion was reorganized and redesignated in August 1917 as the 1st Field Signal Battalion and was assigned to the 2nd Division (2nd Infantry Division after February 1941). While serving with the Division in France, the Battalion fought in six campaigns and was awarded two French Croix de Guerre with Palm and a French Croix de Guerre Fourragere.
Following World War II, the unit was reorganized and redesignated as the 2d Signal Company on 23 April 1921. Under this designation, it would go on to serve in five World War Campaigns, with its service recognized with the award of a Presidential Unit Citation, a Meritorious Unit Commendation, and a Belgian Fourragere 1940 for two citations in the Order of the Day of the Belgian Army. During the Korean War, the Battalion—still designated as the 2nd Signal Company—would take part in all ten campaigns of the war, earning another Presidential Unit Citation and Meritorious Unit Commendation along with two Republic Of Korea Presidential Citations.
In 1957, the Battalion received its current designation as Headquarters and Headquarters Company, 122nd Signal Battalion. It would continue to serve for nearly a half-century more before its eventual inactivation in 2005.
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The five orange and white divisions in the top of the shield portion of the unit crest (officially called a Distinctive Unit Insignia or DUI) denote the five Battalion's WWII battle honors, while the ten red and blue divisions in base stand for Korean War campaigns (and two ROK Presidential Unit Citations). The crest is the badge of the 2nd Signal Company, while the carabao head recalls serving in the Philippine Insurrection. Lastly, six fleurs-de-lis at the top are for service in France during World War II.
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.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.