IX Fighter Command was the primary tactical fighter air arm of Ninth Air Force in the Western Desert Campaign in North Africa during 1942-1943. Reassigned to England, it became the dominant tactical air force over the skies of Western Europe during the 1944 Battle of Normandy and the Western Allied invasion of Germany in 1945. After its inactivation, the majority of its (along with Twelfth Air Force) units were incorporated into the postwar United States Air Force Tactical Air Command.