Roy Evans began his World War II service with the Royal Air Force in England, flying with No. 121 Eagle Squadron, before transferring to the U.S. Army Air Forces in 1941. During the War he became a U.S. Army Air Forces ACE, credited with shooting down 6 enemy aircraft in aerial combat, before he was himself shot down, severely wounded, and interned as a Prisoner of War in February 1945. After a lengthy recovery upon his return home, he was retired as a Lieutenant Colonel.