Oscar Coen grew up in Pound, Wisconsin, and received his bachelor of science degree at the University of Wisconsin, Madison. Enlisting in 1940 into the RCAF, he transferred to the RAF in 1941, joining 71 Squadron RAF. In a daring raid over France he destroyed a complete ammunition train with a pass so low that exploding debris hit his Spitfire. Managing to bail out safely he was smuggled to Spain by the French Resistance, and eventually back to England. With several victories and a DFC to his credit he transferred to the USAAF in 1942 as a Squadron Commander, completing the war as an Ace with 5.5 victories and flying over 250 combat missions. After the war he transferred to the new U.S. Air Force, and retired in 1962 as a Colonel.