Due to its strategic location, the Philippine island group was an obvious target for Japanese expansion, and American pre-war strategists planned on this. After the Japanese take-over of French Indochina and the subsequent U.S. embargo on oil shipments to [[Japan]], reinforcing the American position became even more important. By the time war broke out, over 240 warplanes, including 35 [[Boeing B-17|B-17]] bombers and 107 P-40s, were based in the Philippines. Most of them were at Clark air field and surrounding bases, on the northern island of Luzon. Boyd’s squadron was at Ida, several miles west of Clark. | Due to its strategic location, the Philippine island group was an obvious target for Japanese expansion, and American pre-war strategists planned on this. After the Japanese take-over of French Indochina and the subsequent U.S. embargo on oil shipments to [[Japan]], reinforcing the American position became even more important. By the time war broke out, over 240 warplanes, including 35 [[Boeing B-17|B-17]] bombers and 107 P-40s, were based in the Philippines. Most of them were at Clark air field and surrounding bases, on the northern island of Luzon. Boyd’s squadron was at Ida, several miles west of Clark. |