 Zeamer began elementary flight school training as a flying cadet in the Chicago School of Aeronautics, Glenview, Illinois, where his leadership skills earned him the position of Captain of Cadets of Class 41-B.In March 1941, he received his wings and a commission in the U.S. Army Air Corps after graduating from basic and advanced flight school at Maxwell Field, Alabama.Initially assigned to the 96th Bombardment Squadron of the 2nd Bombardment Group as assistant engineering officer, Zeamer was transferred to the 63rd Bombardment Squadron, 43rd Bombardment Group, where he served as squadron executive officer.