One glance at the Spadefish (SS-411) battle flag shows that she was one of the most successful World War II submarines. Spadefish was the only U.S. submarine launched in 1944 to become one of the war's top ten scoring boats. She downed six ships on her maiden double-barreled patrol and never looked back. In each succeeding patrol, she destroyed at least four ships, including the Japanese aircraft carrier Jinyo. Her ship’s mascot, a beer drinking terrier named Luau, even gave birth to puppies while on patrol. In terms of efficiency, Spadefish managed to sink a ship for every seven and one-third days on patrol - an unparalleled average.