Note that during the Little Rock crisis in 1957[1] it wasn't inconceivable that this could have happened.
The state governor initially used the Arkansas National Guard to block black students from attending Little Rock Central High. Eisenhower federalized the Guard and ordered them to protect the students and let them integrate, and also sent in the 101st Airborne.
It provides a framework that can be filled if and when needed. NG and SDF may very well answer the call - it all depends on what exactly it is in response to.
Good luck to the governor trying to muster the national guard to confront federal troops.