Assignment to 2 Squadron as a pilot followed on 1 February 1920, although it was not until 17 February 1921 that he was granted Aviators Certificate #7911. Whilst stationed at Fermoy, Co. 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.
