In April 1919, he was assigned as a pilot in 106 Squadron. Assignment to 2 Squadron as a pilot followed on 1 February 1920, Whilst stationed at Fermoy, County Cork, Crowe had occasion to become involved in military operations in the Munster region, although his official role was to provide lectures to the Army on air cooperation. On 1 August 1921, he was re-seconded again to the RAF, as a
flying officer. On 17 November 1921, he was granted a permanent commission as flying officer. Four days later, he transferred to 39 Squadron in Iraq as a pilot. He then received three consecutive photo reconnaissance assignments, covering the next four years. On 17 October 1926, he became a
flight commander in 14 Squadron in
Amman, Jordan. He began
RAF Staff College on 30 December 1928. and spent the next three years as Staff, Deputy Directorate of Organization. The next three years saw him serve as officer commanding of, successively, 23 and 74 Squadrons. A series of staff assignments followed this. ==World War II==