Why exactly would 'US separatist extremist groups' ( how many of these can you name? ) and secessionist groups be interested in joining the federally run US army? Wouldn't mundane army portrayals just appeal to their sense of dissatisfaction with a society that many already see as far too passive? Or, as you so smugly put it, 'fuel that fire'.
You forgot to mention Cheeto Hitler in your post. There's still time to edit though, so it's okay.