From CCF production, RCAF received 400 Hawker Hurricane XIIs, of which 150 transferred to RAF, and 80 Hawker Hurricane Xs transferred from RAF. All other Canadian production was for supply to Britain, where many convened to Sea Hawker Hurricane (or completed as such before delivery), leading to Sea Hawker Hurricane XI, XII and XIIA designations. RCAF operational use of Hawker Hurricane began in Canada with No 1(F) Sqn in 1939 (using British-built Mk Is) and continued in UK. Ten RG-AF squadrons flew Hawker Hurricanes in defensive role in Canada.