The USS Arizona was a US battleship built in the 1910s. After serving in World War I and representing US interests abroad, it joined the Pacific Fleet in the 1920s. Throughout the 1920s and 1930s, the Arizona participated in training exercises and provided aid during a California earthquake. In 1940, it was moved to Pearl Harbor to deter Japanese aggression. During the Pearl Harbor attack in 1941, the Arizona was sunk by Japanese bombs and never returned to service. The wreckage remains in Pearl Harbor with a memorial built on top honoring those lost in the attack.