I don't think the likely scenario would be China attacking Taiwan militarily so quickly that the US didn't have time to deploy assets to the region.
It would be like in the past. Civil unrest in Taiwan, followed by a police response from China. If things escalate, it would be in increments. China isn't going to start bombing or killing people right away. The US has contingency plans for everything and every place. If we see a scenario shaping up into something we should deploy into, we'll be there before the fireworks start.
"It's just an exercise that the US had planned for months. China invading Taiwan at this time was a coincidence."
^^This. Much is what we saw with HK. Civil unrest, followed by a police response from China. There were about 100K people in the streets and of all ages, grandma's and young kids too. Then COVID hit and the protest all stopped cold turkey. So what benefit does China have from unleashing a virus...we covered this previously. IDK if you were around or not, LMK if you want my tinfoil cliff notes. They have slowly gotten back on track, but not like how it was before. And the interesting part is many HK people were already wearing P100 rated mask due to the tear gas being used. So stops Covid and tear gas.
There's a good documentary about Joshua Wong about the entire thing. It was on Netflix precovid.
https://www.imdb.com/title/tt6333072/My in-laws were able to get out of HK just before the airport was taken over to attend a funeral in Taiwan (wife's grandma 2019). I asked them what it's like, and their response was if it wasn't for the funeral, they would be in the streets too. They're in their late 60's. I asked what about going back home, they didn't know. All they knew is they have a return ticket and so far the flight isn't cancelled.
Sorry off topic, but to answer your question in more detail, we have the most mobile military in the world. So 1st would be guided munitions either by plane, missiles, or unmanned. Then while the rest of our army gets ready, this should have taken care much of the factories and highest risk targets. If need be, the 75th can deploy anywhere in the world within 72 hours. And they would have air support. The question is where would they deploy? In Taiwan, Japan, China, S. Korea?
To see an advanced war, would bring huge casualties on both sides. When we went into Iraq, their air power was minimal. A-stan, pretty much zero. Going off topic again, but in relation to guided missiles, no FOB would be safe. Which would make them obsolete.