The question isn't "Who will the military side with?" but rather "Who will remain in the military?"
What happens if a white nationalist defection occurs and there are white nationalist militias and corporate mercenary groups to join?
What happens if the DOD is fractured?
In case nobody has noticed, police forces around the country have been upgrading to military gear for decades.
Also, white nationalists have been infiltrating an already racist policing system for decades.
The police are staunchly behind Trump.
The use of local police,
DHS forces like ICE,
Private contractors and right-wing militias is way more flexible and difficult to confront than a straight military deployment.
The split alligences and idea of almost a mercenary force with private security firms involved in the mix (Trump doesn't use the secret service in way previous presidents did - he hired his own force to be loyal to him and not the state) does not bode well.
There is an almighty problem brewing with this situation if it carries on in this direction