The U.S. military doesn't stage any assets in Taiwan, not since shortly after rapprochement with China and establishment of the current strategic ambiguity. The U.S. military is very careful about both what and who it officially permits to land on Taiwan. Occasionally (on the order of years) there are borderline cases, such a research vessel with U.S. Navy ties docking in Taiwan, and it becomes a huge thing in the Chinese media. AFAIU, high-level officers are rarely if ever given permission to enter Taiwan; direct military liaisons in Taiwan are limited to lower level staff officers. When this protocol is broken it's a tit-for-tat situation designed to send a message, and doesn't change anything of substance in how the relationship operates.

Anyhow, the U.S. has no need nor desire to establish a presence on Taiwan. Okinawa and Korea are more than close enough for its purposes, peaceful for otherwise. And if the U.S. were to try to establish a presence, you can be sure China's invasion fleet would reach Taiwan before any significant U.S. materiel could make it ashore.