In the fourth interview session, conducted in Philomath on June 20, 1992, Nyls discusses living in Portland and working for the Forest Service through the National Youth Association. He then talks about working for Boeing in Seattle, Washington, in the years before World War II and about joining the Army Air Corps. He speaks about morale at Boeing after the bombing of Pearl Harbor and describes his feelings about the U.S. government's incarceration of Japanese Americans. He describes his Army Air Corps training at length, including both boot camp and flight training. He also talks about his marriage to Lucile Tinker.