The Distinctive Unit Insignia, familiarly called the Unit Crest
, of the 3rd Signal Brigade employs three lightning flashes similar to those found in the unit's CSIB
. In the unit crest, however, the flashes stand for three communications technologies—MSE, TACSAT, and TROPO—employed by the brigade in force support, and hammer home the unit motto and nickname "Triple Threat." The flashes are placed inside a triangle that is superimposed on three roundels representing rounds of ammo, while the blue, gold, and scarlet color scheme represent the three types of combat arms the unit supports: Infantry, Armor, and Artillery, respectively. The repetition of triad design elements reflects the brigade's numerical designation.