Aubrey had a degree in Mechanics from California Polytechnic University. He served as a flight mechanic in England, working on planes and early helicopters with the 19th Squadron. His basic training was at Camp MacArthur in Waco, TX. He was transferred to the 254th Squadron and served in the AEF from 6 Mar 1918 to 4 Dec 1918. Upon returning to the United States he was stationed at Camp Mills, NY until being sent to Camp Kearny CA for discharge.