Last headquartered at Joint Base Lewis–McChord, Washington, it was part of the 201st Expeditionary Military Intelligence Brigade under I Corps prior to its inactivation 12 May 2021.

[4][5] On 15 April 2013, the 109th MI Bn was notified that it had been awarded the National Security Agency Director's Trophy, "awarded annually by the Director of the National Security Agency to the Army intelligence unit or element judged to have made the most outstanding contributions to the mission during the previous calendar year.

"[6] The trophy was awarded for providing critical signals intelligence support during the battalion's deployment to Regional Command East, Afghanistan.

[7] Blazon Shield Sable, between two flaunches checky Argent (Silver Gray) and Azure (Oriental Blue) a sun in splendor in chief and in base a decrescent Or, overall palewise a lightning flash Gules.

Crest From a wreath of the colors Argent (Silver Gray) and Sable upon two scimitars per saltire Proper, a demi-gryphon Gold Brown, beak, feet and eye Or, armed and langued Celeste, langued detailed of the first, outlined and detailed of the second, clasping a writhing cobra Gris, with its underbelly, mouth and iris Gules, eye, fangs and cowl marking of the first, scaled, outlined and detailed of the second.

The sun and moon symbols and the two hemispheres denote round-the-clock tactical and global deployment capabilities.

The cobra represents forces threatening the safety and security of the Iraqi people and symbolizes a threat that is not easily removed from harm's way.

Description A Silver color metal and enamel device 1 1/8 inches (2.86 cm) in height overall consisting of a shield blazoned: Sable, between two flaunches checky Argent (Silver Gray) and Azure (Oriental Blue) a sun in splendor in chief and in base a decrescent Or, overall palewise a lightning flash Gules.

The sun and moon symbols and the two hemispheres denote round-the-clock tactical and global deployment capabilities.

The battalion was subsequently relieved from assignment to the 9th Infantry Division and inactivated on 15 September 1991 at Fort Lewis.

The 335th ASA Company was activated 15 June 1966 at Fort Riley, Kansas, before being inactivated on 5 April 1971 in Vietnam.

The 9th Military Intelligence Detachment was reactivated on 1 July 1966 at Fort Riley, Kansas, before being inactivated on 25 September 1969 at Schofield Barracks, Hawaii.

On 21 December 1972, the detachment was redesignated as the 9th Military Intelligence Company and activated at Fort Lewis, Washington.