Insignia Description
A silver color metal and enamel device 1 1/8 inches (2.86cm) in height overall, consisting of a shield blazoned: Per bend dove-tailed Argent and Tenné on the last a terrestrial sphere with latitude and longitude lines all of the first; the equator composed of nine telegraph poles Sable. Attached below the shield a silver scroll inscribed "FORTITER ET STRENUE" in black letters.

Symbolism
Orange and white are colors traditionally associated with the Signal Corps. The line of telegraph poles at the equator represents communications encircling the world and the willingness of the unit to perform its mission in any part of the world.

History
The distinctive unit insignia was originally approved for the 30th Signal Construction Battalion on 6 Jan 1943. It was amended to change the blazon of the shield on 3 Mar 1943. On 15 Jun 1992 the insignia was redesignated, with description and symbolism revised, for the 30th Signal Battalion.

Source: The US Army Institute of Heraldry