While a student at the Lawrence Institute of Technology, John volunteered for aviation cadet training in the fall of 1942. He was called up in February 1943, and reported for basic training in May, at Jefferson Barracks, Missouri. In September 1943, John was dispatched to Twenty-Nine Palms, California for his primary flight school and advanced training. In the summer of 1944, he was assigned to 8th Air Force Combat Operations Training, at a base in Tennessee. Once in England, his crew served as a replacement flight crew for the 8th Air Force 100th Bomb Group, commonly known as the “Bloody Hundred.” While overseas, John and his crew flew 32 missions in Germany, including one that ended in a crash landing in Belgium, on January 5, 1945. His crew’s tour of duty ended on March 8, 1945. Upon returning to the United States, John completed his education at the University of Michigan and MIT.