The Texas State Guard is a volunteer organization. There is no pay. If you join you will have the rank you held when you were discharged. I’m not sure they have much authority. The only thing I’ve ever seen them do is direct traffic at festivals.
This training is some scary stuff. It’s very wrong for the military to be training with the local cops. I’ve said for years that local cops will wet their pants with excitement if they’re asked to assist the feds.
Maybe seeing scary professional soldiers close up, will remind the cops that they are just civilians.