The 129th Field Artillery Regiment is a regiment of the Field Artillery Branch of the United States Army. Only the 1st Battalion is presently constituted as an active unit, and is assigned to the Missouri Army National Guard, with its headquarters in Maryville, Missouri, and has subordinate elements located in armories in Albany, Independence, and Chillicothe, Missouri. As a part of the Missouri National Guard, the 1st Battalion, 129th FA is a subordinate unit of the 45th Fires Brigade located in Mustang, Oklahoma.