Third and fourth terms of the presidency of Franklin D. Roosevelt well-defended island of Iwo Jima, taking control of that island the following month. On April 1, the U.S. landed on Okinawa Island, the largest of the Ryukyu Islands. The Japanese allowed the Americans to land on the island before launching a fierce attack that included "kamikaze" suicide attacks by Japanese aircraft. Japanese forces on Okinawa held out until June 1945; U.S. forces suffered over 60,000 casualties during the operation. In late 1943, Roosevelt, Churchill, and Stalin agreed to meet to discuss strategy and post-war plans at the Tehran Conference, which marked Roosevelt's first face-to-face meeting with Stalin. At the conference,
Japanese submarines in the Pacific War Japanese submarines in the Pacific War Japanese submarines in the Pacific War consisted of 169 boats of the Imperial Japanese Navy. During the war Japanese submarines sunk two US aircraft carriers, a cruiser and numerous other warships. Later they became used to resupply isolated island garrisons. The Japanese began the war with an advanced submarine torpedo design, the Type 95. Japanese midget submarines were involved many actions during the Pacific war including the attacks on Pearl Harbor and Sydney Harbour. Japanese submarines shelled and carried out reconnaissance on the continental United States. There were plans for a four boat, 10-airplane