During his tenure as commandant, the Marine Corps faced institutional threats from Army efforts to absorb the mission of the Marines. Though the Navy was sympathetic to the Marine Corps' predicament, it was ready to accept the diminishment of the Corps in exchange for keeping naval aviation from consolidation with the Air Force. The post-war discussions on the restructuring of the American defense establishment opened the door to diminishing the mission and role of the Marine Corps in the new defense structure. Proponents of such cuts included President Harry Truman and General Dwight Eisenhower. In this power struggle, the Marine Corps aligned itself with Congress, warning against the encroachment on civilian oversight within the Army proposals.