On December 7, 1941, the Imperial Japanese Navy led a surprise military strike against the American naval base at Pearl Harbor, Hawaii. The following day, President Franklin Delano Roosevelt declared war against Japan, thus plunging the United States fully into World War II. After the attack on Pearl Harbor, thousands of American men enlisted in the various branches of the armed forces to help their country in the fight against the Axis Powers. Many of these were established Hollywood actors, others became recognizable movie stars in the post-war period. Here are five (more) male actors who served in World War II before or after they were famous. 1. Walter Matthau (1920-2000) Matthau enlisted in the U.S. Army Air Forces in 1942 and was assigned as a radio operator and gunner with the Eighth Air Force. In 1943, he was shipped out to England and was stationed at RAF Old Buckenham in Norfolk, where he served with the 453rd Bombardment Group, the same unit as James Stewart ....