The Ford F60 3-ton 4X4, along with the nearly identical models built by Chevrolet, accounted for over 209,000 of the over 850,000 trucks built in Canada during World War II. In fact, Canada provided the majority of the motorized transport for the British Empire during the war. The Canadian government specified that all Canadian military vehicles be built to British designs and specifications. Ford and Chevrolet combined efforts to develop the CMP (Canadian Military Pattern) series of trucks. Ford built CMP 3-tons, entering wide scale production in 1940. 40-mm Bofors trucks were initially conversions of existing 3-ton cargo trucks. The early models utilized the standard 3-ton cab with seating for only two, which forced the other four crew members to sit in the already crowded gun platform area. In 1944, Ford rectified this by introducing the special wide cab version, as displayed with seating for four. The Swedish designed 40-mm Bofors was the most widely used and successful light anti-aircraft gun of World War II. The U.S. alone produced over 30,000 license-built copies. Due to the Allies achieving air superiority by 1944, very few of the special cab Ford Bofors were built.