He's gonna be the secdef so this means US soldiers shooting protesters. I'm pretty sure most aren't gonna be into it but you probably won't have to look far too find someone who would.
I think they'll have the same beanbags, rubber bullets, tear gas, and pepper ball ammunition as police. Deploying the military to fire live ammunition on protesters is a good way to turn a mass protest into a mass uprising. Why would they bother? It'd make more sense to use the same less-than-lethal rounds and let the protests fizzle out like usual.