Gregor Duncan was drafted into the Army Air Force (AAF) in July 1942, and was sent to Atlantic City, New Jersey for basic training. During his time in Atlantic City, Duncan began doing cartoons and illustrations almost immediately, with work appearing in BEAM, a military newspaper. Duncan's main work during this period appears to have been At Ease, a humorous panel cartoon aimed at the trials and tribulations of those in the Air Corps. It is interesting to note, by the signatures on the At Ease cartoons, that Duncan moved up rather quickly through the ranks, going from Private to Corporal, and again to Sergeant, in seemingly short order. He eventually wound up as an E-5 Staff Sergeant.