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
Japanese Americans mainland of Japan. Studies of the mitochondrial component of Japanese American genes of haplogroup M12 shows a direct correlation of Japanese haplotypes with Tibetans. Other haplotypes that early descents of Japanese people were thought to be carried into include C-M8, which is another Y-chromosome haplotype. Also going back to the Jōmon, that gene is displayed in high frequencies in people of Japanese descent. The estimated percentage of this type of gene in Japanese Americans is about 34.7%. The highest frequencies occur in Okinawans and Hokkaidos. Overall, the genetic makeup of Japanese Americans show very mixed origins of genes, all due