No one would bat an eye if a Carrier Strike group launched F35 fighters to attack the Chinese mainland to disable missiles before they were used. In fact, this is 100% expected strategy for this situation.
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What about a Marine WASP-class assault ship launching helicopters to do the same thing (except cheaper)?
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What about a few Marine Special Ops units infiltrating the beaches under the cover of darkness to support those helicopters? If they're discovered, they could be "plausible deniability" units and arguably the USA never even landed in China.
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What about the regular Marine infantry establishing a beach-head to support those Special Ops units, but never advancing further than just the beach?
Etc. etc. Its a smooth and slippery slope. Its not exactly clear where or how to draw a line. In any case, the Chinese missile forces are going to be a severe issue. I expect at a minimum, F35B fighters from Carriers to be utterly destroying any missile-site they discover. That absolutely means attacks on the Chinese mainland.
Something like this is almost a necessity, so that US Marines could do "something" to support the US Navy. Its probably too much to ask the US Navy to solo all of China by themselves.