USS Bullhead (SS-332), a Balao-class submarine, was the last US Navy ship sunk by enemy action during World War II, probably on the same day that an atomic bomb was dropped on Hiroshima. She was the only ship of the United States Navy to be named for the bullhead.

Fremantle submarine base was the utilisation of Fremantle Harbour as a submarine base in World War II. The submarine base was second only to Pearl Harbor in the Pacific theatre, with US, British and Dutch submarines operating from Fremantle during the war. US submarines operating from Fremantle accounted for approximately one quarter of all US submarine patrols in the Pacific.