Also known as Big Mamie, the USS Massachusetts was involved in countless battles. Commissioned in Boston in 1942, Big Mamie wasn't deemed inactive until mid-1946. This battleship is known to be the first American ship to fire a 16 projectile. This occurred during the 1942 invasion of North Africa, against a French battleship known as Jean Bart. Big Mamie was kept in a reserve fleet until 1962 when it was sold for scrap. Through the aid of local school children and the crew that once ran the ship, money was raised and Big Mamie was brought to battleship cove.
The USS Joseph P. Kennedy, Jr. was also known as Joey P. Built and commissioned in 1945, this ship wasn't deemed in-active until 1973. According to the museum's website, it participated in many different duties for close to 27 years. One of the most intriguing roles it played was in the Cuban Missile Crisis. It also had major roles in different recovery and peacekeeping missions.
The USS Lionfish is a submarine. It was built in 1942 but was not commissioned until 1944. Stationed in the Pacific during 1945 in Japanese territory. After active duty was over, the Lionfish mainly performed in training exercises. The submarine was actually decommissioned in 1953 but called back to duty in 1960. Finally removed from the Navy Registry in 1971, it was added to Battleship Cove in 1973.