Japanese air attacks on the Mariana Islands 1945. While the attacks on Iwo Jima damaged the island's airfields, the Japanese managed to keep at least one of them operational at all times, and none were closed for more than a single day. The need to repair damage to the airfields forced the Japanese garrison on Iwo Jima to divert labor from building defensive positions, however. The combination of heavy losses over Saipan and damage to the airfields on Iwo Jima caused the Japanese to break off their attacks against the Marianas on 2 January. Few Japanese aircraft visited Iwo Jima starting in January, and due to their
30th Division (Imperial Japanese Army) retreat to the Waloe (in now Agusan Marsh Wildlife Sanctuary), but US troops have reached Waloe first, resulting in Japanese retreating to the west after a skirmish 27 June 1945. The scattered Japanese forces have largely survived in the mountains of the Central Mindanao until surrender of Japan 15 August 1945. Some detachments (approximately battalion-sized) of the "30th division" guarding airfields of Sarangani Bay on the far south of the island were eliminated in July 1945. Allentown, PA: 1981 30th Division (Imperial Japanese Army) The was an infantry division in the Imperial Japanese Army. Its call sign was the .