The 320th Field Artillery Regiment is a field artillery regiment of the United States Army. A parent regiment under the U.S. Army Regimental System, the 320th FAR currently has two active elements in the 101st Airborne Division : 1st Battalion, 320th FAR "Top Guns" in 2nd Brigade Combat Team; and 3rd Battalion, 320th FAR "Red Knight Rakkasans" in 3rd Brigade Combat Team. The regiment served with the 82nd Airborne Division during World Wars I and II, and regimental elements have served with the 82nd and 101st Airborne Division, the 193rd Infantry Brigade and the Berlin Brigade, and conducted combat operations in the Dominican Republic, Vietnam, Grenada, Operations Desert Shield and Storm, and the Global War on Terror.

The United States Army Regimental System (USARS) is an organizational and classification system used by the United States Army. It was established in 1981 to replace the Combat Arms Regimental System (CARS) to provide each soldier with continuous identification with a single regiment, and to increase a soldier's probability of serving recurring assignments with their regiment. The USARS was intended to enhance combat effectiveness by providing the opportunity for a regimental affiliation, thus obtaining some of the benefits of the traditional regimental system.