 General Simonds argued the different environments of war at land, air, and sea required different leadership styles and Hellyer's plans to merge all three services into one threatened to dissolve what was necessary for officers in each service.Hellyer's Chief of the Defence Staff, Air Chief Marshal Frank Robert Miller, resigned in protest against unification, as did two generals who resigned in 1964 and seven admirals in 1966.After Air Marshal Miller resigned, Hellyer appointed General Jean Victor Allard as Chief of the Defence Staff, who supported unification as a way of promoting the "French fact" in the military.