Under the terms of the 1930 London Naval Treaty, "Wyoming" was to be demilitarized and converted into a training ship. During the demilitarization process, her anti-torpedo bulges, side armor, and half of her main battery guns were removed. "Wyoming" was modernized at Norfolk Navy Yard from 12 January to 3 April 1944; the reconstruction removed the last of her three 12-inch gun turrets, and replaced them with four twin and two single enclosed mounts for 5-inch/38 caliber guns. New fire control radars were also installed; these modifications allowed "Wyoming" to train anti-aircraft gunners with the most modern equipment they would use while in combat with the fleet. Modifications to "Arkansas" during World War II were kept to a minimum. In 1942, "Arkansas" received a new tripod foremast and bridgework, along with more anti-aircraft guns throughout the war. By 1945, she carried nine quadruple 40 mm Bofors mounts and twenty-eight 20 mm Oerlikons, and the number of 3-inch guns had been increased to ten.