Of all the Iowa class battleships (USS Iowa, USS Wisconsin, USS Missouri, USS New Jersey); only the USS New Jersey saw combat in Vietnam from 1968 to 1969. The New Jersey fired nearly 6,000 sixteen inch shells and almost 15,000 five inch shells at enemy targets in Vietnam. She fired more rounds in Vietnam than she did during WWII.
During her tour on the gunline, the New Jersey was the ONLY active battleship in the world; as well as the last all gunned battleship to be engaged in combat. (After Vietnam the Iowa's were equipped with CRUISE MISSILES) to supplement their 16" guns.