Yep, sitting ducks for a copycat...
We on the southern border have Monthan Air Force base, Ft. Huachuca and the border outposts to be concerned about, that I fear, but pray to God, do not get attacked.
I am not military strategist or analyst, but hitting us fast, in multiple places that are of significant meaning, brazenly, and cleverly, would definitely strike terror into our hearts.
So we should try not to just react, but outwit them. If I were the military and intelligence, I would rout them out in their lairs before their first morning butt salute.