 During 1943 and 1944, Allied forces, backed by the industrial might and vast raw material resources of the United States, advanced steadily towards Japan.The Sixth United States Army, led by General MacArthur, landed on Leyte on October 20, 1944.In the subsequent months, during the Philippines Campaign (1944–45), the combined United States forces, together with the native guerrilla units, liberated the Philippines.