Why Operation Downfall is difficult to study

Which books cover all aspects of the planned 1945-46 invasion of Japan?

There is no simple comprehensive recommendation; the unexecuted operation is unusually complex, though Australian studies and war-gaming work may help.

Projected battles attract less scholarship than campaigns that actually occurred. Operation Downfall is especially demanding because an amphibious invasion of Japan would combine naval, air, ground, logistical, and landing problems. No single operational record resolves how those systems would have interacted in 1945 or 1946. War-gaming studies may help, although the subject requires more digging than a conventional battle history.