The 278th Armored Cavalry Regiment, previously the 117th Infantry Regiment, is an armored brigade combat team of the Tennessee Army National Guard with headquarters in Knoxville, Tennessee. It is the only National Guard Armored Cavalry Regiment and one of only two in the entire US Army order of battle, the other being the active duty 11th ACR. The unit traces its lineage from the volunteer militias of Eastern Tennessee and has participated in conflicts from the Revolutionary War to the Global War on Terror.

Camp Shelby is a military post whose South Gate is located at the southern boundary of Hattiesburg, Mississippi, on U.S. Highway 49. It is the largest state-owned training site in the nation. During wartime, the camp's mission is to serve as a major independent mobilization station of the United States Army Forces Command (FORSCOM). Camp Shelby Joint Forces Training Center is the largest reserve component training site, covering 136,000 acres (550 km2), allowing up to battalion-level maneuver training, Gunnery Table 8-12, field artillery firing points and a wide range of support facilities. This is the normal Annual Training location for National Guard and Reserve units located in Mississippi, Alabama, and Tennessee. However, units from across the country use its assets to support a variety of missions. The 2nd Battalion, 114th Field Artillery conducts its gunnery training and has the bulk of its combat equipment stored in the Mobilization and Annual Training Equipment Site (MATES) located there.