The 133rd Field Artillery Regiment's lineage is carried by 1st Battalion, 133rd Field Artillery, a unit of the 72nd Infantry Brigade Combat Team, and 3rd Battalion, 133rd Field Artillery, a unit of the 56th Infantry Brigade Combat Team, both brigades of the 36th Infantry Division.
In October 2009, Headquarters and Headquarters Battery, Alpha Battery, and Bravo Battery from 1st Battalion, 133d Field Artillery were mobilized for service in Operation Iraqi Freedom as part of the 72nd Infantry Brigade Combat Team.