Hitler did not use the military to terrorize his opponents. He had his brown shirts do the dirty work of chasing anyone opposed to him out of office -- later when he was more secure in his power he put his opponents in concentration camps starting in the late 30s.
We have already seen how Trump incites his MAGA brownshirts to violence on January 6th. Obviously Trump could also incite them to invade the Supreme Court building and chase out any justices which did not follow his dictates.
Trump is setting the table to be a dictator. He has no interest in democracy.