The 110th Chemical Battalion Distinctive Unit Insignia (also called a unit crest, or DUI for short) was approved on 28 March 2006. It has two main components: a hexagon-shaped shield and a scroll attached to the bottom of the shield. The hexagon shape is borrowed from the Chemical Corps branch insignia, and the cobalt blue and golden yellow colors that make up most of the insignia are likewise branch colors.
At the top of the insignia, the two hexagon sides simulate a chevron, which in turn alludes to a peak or mountain that represents the mountainous areas found on Okinawa and Fort Lewis, two locations where the unit served. A dragon, an image commonly seen on Chemical Corps insignia because of its association with strength and destruction but also vigilance, is combined with artillery shells to suggest the operational delivery of chemical agents; the shell with greens bands stands for a weapon delivering a known chemical weapon, while the unmarked shell represents an unknown threat. The combo of dragon over crossed shells is actually derived from the original insignia of the First Gas Regiment, the first Chemical Corps units.
Five stars in the “chevron” represent five campaigns that the unit fought in during World War II while designated as the 33rd Chemical Company; they also denote the Battalion’s current missions of Chemical, Biological, Radiological, Nuclear, and high-yield Explosives (CBRNE).
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.
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The 110th Chemical Battalion was originally designated the 33rd Chemical Decontamination Company, constituted in the Army of the United States on 11 July 1942 and activated a month later at Camp Blanding, Florida. Following its WWII service, it was inactivated from October 1945 until December 1953 it was made the HQ and HQ Detachment, 110th Chemical Battalion and allotted to the regular Army. It was activated on 5 January 1954 on Okinawa and inactivated less than a year later on 28 December 1954, marking the start of fifty-plus years of inactivation. Redesignated as HHC, 110th Chemical Battalion on 9 July 2004 with its organic elements constituted at the same time, the unit emerged from its administrative slumber with its activation on 17 September 2005 at Fort Lewis.
As of Summer 2023, the 110th Chemical Battalion was a component of the 48th Chemical Brigade and stationed at Fort Cavazos, Texas.