The 31st Field Artillery Regiment is a field artillery regiment of the United States Army, first Constituted in 1918 in the National Army (USA). The 1st Battalion, 31st Field Artillery, was constituted 5 July 1918 in the National Army as the 31st Field Artillery and assigned to the 11th Division. The "Proud American" Battalion is credited with participating in multiple campaigns in World War II and the Korean War. It has been distinguished with several decorations, to include the Philippine Presidential Unit Citation and the Republic of Korea Presidential Unit Citation that was awarded on three separate occasions.