After seeing active combat duty as a fighter pilot in the latter stages of the First World War Vasse was transferred to the unemployed officer list in September 1919.
After a short one-month period as a supernumerary at the Central Depot over the Christmas of 1925 he was granted a permanent commission in January 1926 and posted as an instructor to the RAF's Air Armament and Gunnery School.
Promoted to flight lieutenant in July 1927, in March 1929 he was appointed Armaments Officer at the RAF North Coates gunnery practice range in Lincolnshire where he remained until November 1930.
[1] Returning to the United Kingdom in 1936 he was appointed as a Staff Instructor at the Air Armament School on promotion to squadron leader.
[1] Vasse would remain at Duxford, becoming Station Commander there, on promotion to group captain, until July 1941 when he was appointed deputy director of the RAF Air Tactics department.
[1] In March 1951 Vasse was posted to RAF Bentley Priory and took over as the seventh Commandant Royal Observer Corps from Air Commodore Sir Richard Bowen Jordan.