It was based at Fort Hood, Texas, but was inactivated on 15 April 2008 as part of the transformation of the U.S. Army to a Modular Force Structure.

On order, the 3rd Signal Brigade deployed to a theater of operations, provided command and control communications to the III Mobile Armored Corps (Phantom), and redeployed.

A Company was detached to augment 4th Infantry Division communications support in northern Iraq, based primarily in Tikrit.

For the first time in its history, the entire HHC, 3rd Signal Brigade deployed overseas in support of a real world mission.

The battalion was attached to the 11th Armored Cavalry Regiment and provided communications support in northern Iraq, primarily in Mosul from Camp Courage/Freedom (formerly Saddam Hussein's northern palace), Camp Marez, and the Mosul Airfield, but also in smaller towns, such as Tal Afar and Dahuk.

Symbolism: The three roundels represent rounds of ammunition and, together with the colors blue, gold and scarlet, refer to the organization's mission to support the combat arms; Infantry, Armor, and Artillery.

The three flashes denote the unit's triple-threat capability in the performance of its mission, adding emphasis to the motto "TRIPLE THREAT."