The 1st Battalion, 121st Field Artillery is currently part of the 157th Maneuver Enhancement Brigade that is based out of Milwaukee, Wisconsin.

The 1-121st FA originally operated M109 howitzer before switching to the M270 Multiple Launch Rocket System (MLRS) in 2003.

On 30 June 1916, Battery A, 1st Field Artillery was called to active duty on the Mexican border as organized forces were making raids into the United States.

Later 4,000 National Army troops from Wisconsin and Michigan were transferred to the Division shortly before it left for France.

On 4 August 1917, Battery F, 121st Field Artillery regiment, was the first unit of the new division to arrive at Camp MacArthur, Texas.

From that time until late in September troops continued to pour in as rapidly as railroad facilities could be provided to transport them from the north.

Along with the General of the Armies John J. Pershing's personal commendation, the regiment received the battle streamer of the French Croix-de-Guerre with Silver Star embroidered Aisne-Marne and Oise-Aisne.

The 121st Field Artillery Battalion, as designated on 1 February 1942, distinguished itself in the Pacific Theatre of Operations.

On 15 October 1961, all battalions of the 121st Field Artillery were called to active duty with the 32nd Infantry Division for the Berlin Crisis.

On 1 November 1964, the colors of the 1st Battalion, 121st Field Artillery were transferred from River Falls to Whitefish Bay.

On 5 November 1973, the 1st Battalion, 121st Field Artillery was called to state duty for a firefighters strike at Milwaukee.

On 1 March 1981, the 1st Battalion, 121st Field Artillery was called to state duty for a firefighters strike in Milwaukee.

In April 2006, the 1st Battalion 121st Field Artillery Regiment was mobilized in support of Operation Iraqi Freedom and moved to Camp Shelby, Mississippi.

[3] The 1st Battalion 121st Field Artillery Regiment was mobilized between January and October 2013 at Fort Bliss, Texas before deployment to Afghanistan in support of Operation Enduring Freedom.