Japan manufacturing sites not only locate in Japan land.
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That's the thing. We have offshored over 4500 manufacturing sites in China, and then some 4000+ in ASEAN, another 1200 in India, and some more in Bangladesh. This is just in Asia.
We also have manufacturing sites in Canada, USA, Mexico, Latin America and in Europe.
We had been inspired by the US Aegis.
However, Japan is totally dependent on the US technology.
The things like SPY-1D, MK41, LM2500 are definitely the US technologies, while China doesn't need any foreign technology to build its own navy.
Man. You know i just zipped up after talking to @Genesis , now you want me to unzip again?