5. Air. (See Appendix "B"). We estimate that the Japanese air forces will have in tactical units a maximum of 2,000 combat aircraft, of which 1,400 will be based in the home islands. Practically all remaining air strength will be located in Manchuria, Korea and North China. Consideration must also be given to combat aircraft in operational training; units and intermediate trainers in training units, which would be available for suicide attacks. Of the former 500 600 will be located in Japan Proper, and of the latter some 2,000 might be available for this purpose.