General Motors ranked first among United States corporations in the value of wartime production contracts. GM's William S. Knudsen served as head of U.S. wartime production for President Franklin Roosevelt. The General Motors UK division, Vauxhall Motors, manufactured the Churchill tank series for the Allies. The Vauxhall Churchill tanks were instrumental in the UK campaigns in North Africa. Bedford Vehicles and GM of Canada, CMP manufactured 500,000 logistics vehicles for the UK military, all important in the UK's land campaigns. In addition to the obvious manufacture of motor vehicles for the Allied cause, GM was also a major manufacturer of aircraft.