Initially, 12th AF was a composite organization containing both strategic heavy bombardment groups; and tactical light and medium bombardment, fighter-bomber, and fighter groups. Based in French Morocco and Algeria after Operation Torch, it became very important for 12th AF to coordinate and cooperate with the Royal Air Force which had been fighting in North Africa for two years. Such Allied cooperation was a major concern of American President Franklin D. Roosevelt, British Prime Minister Winston Churchill, and their staffs at the Casablanca Conference in January 1943 where they created the Mediterranean Air Command (MAC) with Air Chief Marshal Sir Arthur Tedder as Air Commander-in-Chief. For planning of the Tunisia Campaign, Tedder's MAC headquarters were adjacent to those of his immediate superior, the Supreme Allied Commander, General Dwight D. Eisenhower at Algiers, Algeria soon after the new Allied air force reorganization took effect on 18 February 1943.