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
Internment of Japanese Americans (including the President Franklin D. Roosevelt and FBI Director J. Edgar Hoover) dismissed all rumors of Japanese-American espionage on behalf of the Japanese War effort, pressure mounted upon the Administration as the tide of public opinion turned against Japanese Americans. Civilian and military officials had serious concerns about the loyalty of the ethnic Japanese after the Niihau Incident which immediately followed the attack on Pearl Harbor, when a civilian Japanese national and two Hawaiian-born ethnic Japanese on the island of Ni'ihau violently freed a downed and captured Japanese naval airman, attacking their fellow Ni'ihau islanders in the process. Several concerns