After completing his education at the University of Alberta (where he gained a BSc) Miller joined the Royal Canadian Air Force at Camp Borden on September 15, 1931, with the rank of pilot officer.

[1] Miller then underwent further training before becoming an instructor at the Camp Borden flying and navigation school in 1935.

At the outbreak of war in September, Miller was the Officer Commanding of the Air Navigation and Reconnaissance School, Trenton.

[1] Promoted to acting group captain in July, he commanded the General Reconnaissance School on Prince Edward Island before moving to the Air Force Headquarters in January 1943 where he served as Director of Training Plans and Requirements.

No 61 Base was headquartered at Topcliffe and commanded the RAF establishments at Dalton, Dishforth, and Wombleton.

He was then posted to Supreme Headquarters Allied Powers Europe as General Lauris Norstad’s Vice-Deputy Air.