 The tug was sunk by a Japanese submarine in 1943.Following shakedown and a brief tour on the east coast, "Navajo", an oceangoing fleet tug, steamed to San Diego, where, in June 1940, the boat reported for duty in Base Force, later Service Force, Pacific Fleet.Until the Japanese attack on Pearl Harbor, the ship's towing and salvage capabilities were utilized in the central and eastern Pacific, and then, after 7 December 1941, in the Pearl Harbor area.