No way you could pull off a full scale invasion. Especially of somewhere like the US. You'd need millions of troops in containers due to the armed populous, and they'd be doomed due to not having established supply lines. You use it to deploy commandos to disrupt defensive forces long enough to make a real landing. In the case of Taiwan/China you'd do something like have them flood out into a harbor in Penghu in the middle of the night as Chinese paratroops hit the islands trying to capture the airfields, meanwhile transport ships and more aircraft stream in to reinforce the briefly captured airfields and ports before the Taiwanese military can muster and launch a counter attack. Jinganli would be a good option with a secondary airfield and multiple small ports right next to each other.I've always thought the easiest way to invade the US would be through container ships. Using containers modified to hold 10 troops and supplies, transport them anywhere in the US and on D-Day SURPRISE , combat ready infantry squads in a neighborhood near you.
How many containers do you think would be necessary to overtake a city?