The HHC, 503rd Army Security Group was constituted as the 323rd Signal Company, on 23 July 1942 and activated in Miami, Florida on 1 September 1942.

While stationed on the Marshall Island during World War II, the company supported Army Air Corps units in the Pacific Theater.

[7] The former MI brigade, which included reservists, and National Guardsmen, as well as active-duty soldiers, transformed into the 201st BfSB within a year.

The brigade stand-up required an almost total overhaul, complete with equipment, vehicles, amended missions and hundreds of new active-duty soldiers.

Three hundred forty-five "whirlwind days" of preparation ended 23 Sep when the 201st Battlefield Surveillance Brigade, with its subordinate battalions, cased their colors for deployment to Operation Iraqi Freedom.

The 109th Military Intelligence Battalion activated in October 2008 to resume its 25-year-old legacy at Fort Lewis as formerly the 9th Infantry Division's primary intelligence-gathering arm.

The 502d Military Intelligence Battalion went through a transformation of its own to conform to the collection needs of the newly modular, self-sufficient brigade.

The brigade and its organic intelligence systems played a major role in the Army's Transformation Project that took shape at Joint Base Lewis-McChord.

This transformation included another overhaul of the current structure to the reconnaissance, surveillance, and target acquisition (RSTA) format.

The lightning bolts refer to the electronic warfare capabilities of the unit and the commander's need for accurate and ready intelligence from all sources.

The blue disc superimposed by the silver polestar symbolizes the world and the far reaching capabilities of the unit.

The blue and silver wavy bars allude to World War II campaign participation in the Pacific.

The units have the tools to respond to the commanders need from unmanned aerial vehicles to signals gathering equipment and human intelligence collectors.