Sounds like something out of a futuristic dystopian movie.

spoiler

I haven't seen a terrorism act invoked in my state but police have called a few designated areas this year and they bring the cavalry mounted troops to most protests.

I’m calling it now. Somebody’s gonna die or get seriously injured

Big ten-thousands protests generally try to be more big-tent than radical, so as eager as police are to make a show of force against anti-military protesters, my bet is that it will be limited to shoving. But honestly, I won't be shocked if your call turns out right.