We influenced the Japanese Constitution (Article 9), which essentially limits the ability of Japan to have an armed forces beyond defensive capabilities. Time for Japan to build a robust military to counter the Chinese.
The Japan Air Self Defense Force looks an awful lot like a small well equipped Air Force with some power-projection capability, designed for joint operations with the United States Air Force.
The Japan Ground Self Defense Force, at least, looks like its task and purpose is defending the homeland. It doesn't appear to have much expeditionary capability.