At the age of twelve, American William R. Dunn decided to become a fighter pilot. In 1939 he joined the Canadian Army and was soon transferred to the Royal Air Force. He was the first pilot in the famous Eagle Squadron of American volunteers to shoot down an enemy aircraft and later became the first American ace of the war. After joining the U.S. Army Air Corps in 1943, he saw action in the Normandy invasion and in Patton's sweep across France. Twenty years later he fought again in Vietnam.