The secondary battery consisted of 20 5 in (127 mm)/38 cal guns in ten twin turrets, which could fire at targets up to 10 mi (16 km) away. With the advent of air power and the need to gain and maintain air superiority came a need to protect the growing fleet of allied aircraft carriers; to this end, Wisconsin was fitted with an array of Oerlikon 20 mm and Bofors 40 mm anti-aircraft guns to defend allied carriers from enemy airstrikes. When reactivated in 1986, Wisconsin had her 20 mm and 40 mm AA guns removed, and was outfitted with Phalanx CIWS mounts for protection against enemy missiles and aircraft, and Armored Box Launchers and Quad Cell Launchers designed to fire Tomahawk missiles and Harpoon missiles, respectively.[7] Wisconsin and her sister ship Missouri were fitted with thicker traverse bulkhead armor, 14.5 inches (368 mm), compared to 11.3 inches (287 mm) in the first two ships of her class, the Iowa and New Jersey.[8]