A Silver metal and enamel device 1 1/8 inches (2.86 cm) in height overall consisting of a shield blazoned: Argent issuant from base four mountains Tenné, spanning each peak a flash Gules, in chief a bear's head erased Sable. Attached below the shield a Black scroll inscribed "WE GET THE MESSAGE THROUGH" in Silver letters.
Orange and white are the colors of the Signal Corps. The functions of the organization are implied by the four mountains representative of the state of activation, California, and connected by the signal or lightning flashes implying immediate contact. The bear's head is added for design and further refers to the grizzly of California, heraldically symbolizing a policy equal to the great strength of the bear and anciently was employed as an emblem of ferocity in the protection of kindred.
The distinctive unit insignia was originally approved for the 4th Armored Signal Battalion on 19 February 1943. It was redesignated for the 4th Signal Battalion, Corps, on 20 March 1953. The insignia was redesignated for the 4th Signal Battalion (Corps) on 15 March 1955.