On the day Hiroshima was destroyed by an atomic bomb, two Ki-51s scored the last Japanese victory against US submarines, and of which is confirmed as the 52nd USN submarine lost during the war; essentially, she would have been second to last, as USS Halibut (SS-232) was irreparably damaged in action months before Bullhead was lost, and was decommissioned in early 1945. Two depth charges hit USS Bullhead (SS-332), in which she later exploded and sank with all hands.
Charles Lindbergh, flying a P-38 Lightning shot down a Ki-51 after a vigorous dogfight in which the much slower Ki-51 utilized its low speed maneuverability and made a fight of it.
Ki-51: 2,372 built (Manufacturers: Mitsubishi (1,462), Tachikawa Army Air Arsenal (913))
Mansyu Ki-71: three prototypes of a tactical reconnaissance variant built by Mansyu with a retractable landing gear, did not enter production.
Reconnaissance Version Ki-51A
Assault Version Ki-51B. The assault version had armor plating protecting the pilot and oil tanks, and bomb racks to carry 441 lbs of bombs. This version could be modified in the field to carry an aerial camera.
Indonesian Air Force - In 1945, Indonesian People's Security Force (IPSF) (Indonesian anti-Dutch Militia)
captured a small number of aircraft at numerous Japanese air bases, including Bugis Air Base in Malang (repatriated 18 September 1945). Most aircraft were destroyed in military conflicts between the Netherlands and the newly proclaimed-Republic of Indonesia during the Indonesian National Revolution of 1945-1949.