The North American Harvard appeared in 1937, in response to a US Air Corps proposal for an advanced trainer. The first Harvard Mk’s ordered by the Canadian Government were delivered to RCAF Sea Island, British Columbia in July 1939. By early 1940, the Mk. IIs was being assembled in California with an all metal fuselage replacing the original tube and fabric structure. In all, 1200 Mk. IIs were supplied from US sources until Canadian built Harvards started being produced in 1941.