A Silver color metal and enamel device 1 1/16 inches (2.70 cm) consisting of a shield blazoned: Tenné three telephone wires bendwise interlaced with one of the like palewise, between two cornets all Argent. Attached below the shield a Silver scroll inscribed "FIRMITER MANEO" In Black letters.
Orange and white are the colors of the Signal Corps. The functions of the organization are illustrated by the taut telephone wires and two cornets (medieval signal horn), the numerical designation being indicated by the group of three wires and the single strand. The motto translates to "I Remain Steadfast" and is suggestive of the character of the personnel in the performance of their duties.
The distinctive unit insignia was approved on 9 January 1943. It was amended to correct the motto on 16 February 1943.