Archibald Mathies enlisted in the Regular Army on December 30, 1940, at Pittsburgh, Penn. He was attached to Headquarters and Headquarters Squadron, 8th Pursuit Wing, and later assigned to the 36th Air Base Group, Maxwell Field, Alabama. On March 5, 1941, he was transferred to the 31st School Squadron, Jefferson Barracks, Mo., where he remained until March 24, 1941. He then was attached to the 36th School Squadron, Chanute Field, Illinois, where he attended the Airplane Mechanic School, from which he graduated on October 1, 1941.