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The future is amphibious.
For decades, Tokyo’s plans to defend the homeland were frozen in amber. During the Cold War it was assumed, that in the event of war the Soviet Union would invade the northern one-third of the country. A powerful tank corps to contest a Soviet landing, a strong air force to beat back city-destroying bombers and a strong destroyer force to keep open the sea-lanes would be all that was needed to hold out until the Americans arrived.
The defense plan staggered on after the end of the Cold War like a zombie, even after the evaporation of the Soviet threat, for lack of anything better to plan for. Now the rise of the Chinese military and Beijing’s claims on what Japan calls the Senkaku Islands have Japan reorganizing its forces to face new potential threats to the south.