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.

Bullhead was commissioned 4 December 1944 and spent the next three months doing shakedown training around Narragansett Bay, Key West, and the Panama Canal Zone before heading to Pearl Harbor and then Guam.

Sheridan had just finished covering B-29 firebombing raids over Tokyo, and requested permission to go on a submarine war patrol from the office of Commander-in-Chief, U.S. Pacific Fleet (CINCPACFLT) Admiral Chester W. Nimitz.

[10] On 19 April, an aircraft — possibly another U.S. Army Air Forces B-24 Liberator, although Sheridan reported it as being a Japanese floatplane — dropped two depth charges on Bullhead as she submerged in the South China Sea.

On 19 June, Bullhead conducted an extensive surface gun action off St. Nicholas Point, Java where she sunk or damaged several small coastal freighters.

[15] On 24 June, Bullhead spent several hours stalking an 8,000-10,000 ton ship with red cross markings that was operating suspiciously, but Griffith was denied permission from headquarters to attack it with torpedoes.

Griffith spent a few weeks planning Bullhead's third patrol with Holt before departing for Guam to become Assistant Operations Officer to Vice Admiral Lockwood.

On 4 August, Bullhead met the Dutch submarine HNLMS O 21 350 miles south of the Lombok Strait and transferred a sack of mail intended for the United States.

However, one occurred on 6 August 1945, when a Mitsubishi Ki-51 from the 73rd Independent Chutai (literally "company" or squadron) of the Imperial Japanese Army Air Force attacked with depth charges.

Since the position given is very near the Balinese coast, it is presumed that the proximity of mountain peaks shortened Bullhead's radar range and prevented her from receiving a warning of the plane's approach.