Britanon here. It's not clear to me what the real purpose of such a deployment would be. I work with a lot of ex-military types and they're generally in favour of brexit.
May is either cabal - assuming the photo of her and Merkel when younger is real - or else being blackmailed by the cabal over her father-in-law's pedogate ties. If the UK crashes out of Europe with a no deal, I read that the European project is finished. So the cabal will fight with every dirty trick in the book to prevent this from happening.
In this instance the army would likely be deployed to round up troublemakers that soros et al activate as pay back.
I think her majesty's view will come into play here. She is the Head of the armed forces after all. The retribution of soros would include the aristocracy, of which she is part