When MacArthur returned to active duty, the latest revision plans for the defense of the Philippine Islands had been completed in April 1941 and was called WPO-3, based on the joint Army-Navy War Plan Orange of 1938, which involved hostilities between the United States and Japan [REF].
However, in April 1941, the Navy estimated that it would require at least two years for the Pacific Fleet to fight its way across the Pacific.