What You Need to Know: The 16-inch/50-caliber Mark 7 gun ... to achieve penetrating power similar to that of Japanese 18.1-inch guns, despite weighing less. “In 1969, Capt.

The Iowa-class battleships, the last and largest battleships built by the U.S. Navy, played a crucial role during the Korean War. -Reactivated from reserve status, the USS Missouri, Iowa, New Jersey, ...