Also worth noting of that -1600. A fair % have family friends and even lovers not living in texas. In 2024 with easy transport etc and cheap communication. It really is impossible for any state to relly on its own current resources. Things would shuffle hugely in the lead up and post the first attacks. Likely the 1600 would grow from good old boys joining. But experience and command structure would be a mess for a while.

Of course US forces would see the same but less so. Some would have friends and relatives in texas. Many would bulk at the domestic part of foreign and domestic.

Professionals.s following orders can only go so far as far as preventing personal politics.

Even in the civil war many refused allegence to the side they were expected to fight for. With Internet and more communication of the 2000s. Allegiances will be less not more founded.