The London Naval Treaty of 1930 mandated that "Wyoming" be demilitarized; she accordingly was converted into a training ship, with half of her main battery turrets, belt armor, and anti-torpedo bulges removed. However, "Arkansas" was permitted to continue in service with the fleet. After the United States entered World War II, "Arkansas" was used to escort convoys to North Africa. By 1944, she served as a coastal bombardment vessel; in this role, she supported Allied landings at Normandy (Operation Overlord) and southern France (Operation Dragoon) before being transferred to the Pacific, where she provided fire support to Marines fighting on Iwo Jima and at Okinawa in 1945. "Wyoming" meanwhile continued as a training ship, being modified further in 1944 to include the various types of anti-aircraft guns that trainees would operate in the fleet. Both ships were decommissioned shortly after the war, with "Arkansas" being expended as a target ship during the 1946 nuclear tests at Operation Crossroads, and "Wyoming" being sold for scrap in 1947.