They don't need the military. The police have already been militarized and have zero issue using violence against the populace as has been demonstrated time and time again.
Also respectfully, as a vet, the military is not homogenous and Trump will absolutely find the people in the military that will listen to him and put them in charge
This is the first time trans people have been one of the pillars of a winning candidates platform. They spent $215 million on anti trans ads specifically, or 40% of their entire marketing budget. You don't invest that amount of resources into dehumanizing a minority without having dire intentions. Trans people have been discriminated against before, but not like this.