Insignia Description
A silver color metal and enamel device 1 3/16 inches (3.02cm) in height overall consisting of a shield blazoned: Sable, a bend Tenné fimbriated Argent between a telegraph pole and an X frame of the third. Attached below the shield an Orange motto scroll inscribed "CLEAR AND OPEN" in silver letters.

Symbolism
The insignia consists of the shield and motto of the coat of arms.

History
The distinctive unit insignia was approved on 26 Oct 1942.

Source: The US Army Institute of Heraldry