Perhaps. But if the SHTF, I'd be very, very surprised if a sizable number of our troops did not either throw down their weapons and refuse, or actively join the other (our) side.
Bunk
Troops wouldn’t know who’s the good guy is and who’s the bad guy is. They would only know what they have been told and they would disarm everyone. Anyone fires on them when they are doing it is the bad guy no matter what side it is.
The troops job would be to restore order, and they would do it.