Of all the celebrities who served their country during World War II-and they were legion-Jimmy Stewart was unique. On December 7th, when the attack on Pearl Harbor woke so many others to the reality of war, Stewart was already in uniform-as a private on guard duty south of San Francisco at the Army Air Corps Moffet Field. Seeing war on the horizon, Jimmy Stewart, at the height of his fame after Mr. Smith Goes to Washington and his Oscar-winning turn...