It seems the Japanese must have had an extremely small cadre of very well trained pilots. From what I've been reading, Guadalcanal took most of them.
I know that the Germans had a controversial system that kept their aces in the air, instead of rotating them back for training purposes like the Allies(and war bond sales

). I can only assume the Japanese had the same setup. Even in '45, though, the Germans were still able to field a powerful and effective air corps. (Baseplate)
What is really interesting to me is how fast the Japanese deteriorated. It seems like almost within a year to a year and a half they completely expended all of their best forces. They had excellent naval, air, and ground forces - yet, seemingly, no effort was made to replace them. Resources, resources...
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