A gold color metal and enamel device 1 3/16 inches (3.02 cm) in height consisting of a representation in scarlet of the bell tower of a California Mission, with three scarlet bells in gold arched openings, all above a gold scroll with the motto "STRIKE FOR FREEDOM" in scarlet letters.
The color scarlet is for Artillery. The bell tower of a California Mission refers to the unit's activation during World War II at Camp Haan, near the old Mission Trail. The three bells indicate the numerical designation of the Corps.
The distinctive unit insignia was originally approved for the 14th Field Artillery Brigade on 12 February 1943. It was redesignated for the III Corps Artillery and amended to change the symbolism on 6 January 1971.