He was drafted in March 1942 and served in World War II as a special agent in the Counterintelligence Corps (CIC) with the 97th Infantry Division, in the "Ruhr Pocket" and then in Japan after the war. On April 23, 1945 Macauley's division helped liberate Flossenbürg concentration camp. Macauley later said, "I entered some concentration camps the day we liberated them--the most horrifying days of my life. My job was to interview survivors. Most of the bodies that I saw had been stripped and it was impossible to tell which were those of Jews and which of Christians. Nazi murder was a great leveler, fully ecumenical... Hitler's bell tolled for all..."