A Silver color metal and enamel device 1 1/8 inches (2.86 cm) in height overall, consisting of a shield blazoned: Azure, issuing from clouds in chief Proper a lightning flash in bend Or. Attached below the shield, a Silver scroll inscribed "POST NUBILA VICTORIA" in Blue letters.
Shield: Cobalt blue is a color traditionally associated with the Chemical Corps. The lightning bolt is indicative of the suddenness and speed of execution of a chemical attack when fired from a primary weapon. The combined elements of the design are suggestive of the relationship between the elements and chemical warfare. Motto: The translation of the motto, "After the Clouds, Victory," has a two-fold significance; the primary being that the victory comes easily after a chemical attack, and secondary, that perseverance through a period of hardship and setbacks is necessary in order that victory be won.
The distinctive unit insignia was approved on 25 November 1942. It was amended to revise the description and symbolism of the design and correct the spelling of the motto on 5 August 1988.