A division of the GHQ Air Force into four geographical air defense districts followed its assignment to the activated Army General Headquarters in November 1940, converted in March 1941 into numbered air forces, with a subordinate organization of 54 groups.
A division of the GHQ Air Force into four geographical air defense districts followed its assignment to Army General Headquarters, activated in November 1940 to plan and execute expanded training of ground forces. These were converted in March 1941 into numbered air forces with a subordinate organization of 54 groups.