My late father was assigned to the 3rd Battalion, 4th Marines, and was a defender of Bataan and Corregidor. How can I learn more about the exact combat duties of 3/4 before being surrendered? While he never spoke much about his time in PI, I always understood that he was captured on Bataan. Some reading indicates only US Army and PA units defended Bataan, and 3/4 was actually on Corregidor. How can I learn the facts about 3/4's combat role at that time?