Is your house earth-bermed? If not why not? (just kidding)
It can be in fairly short order should that become necessary.
We also have pre cut pieces of 3/4 inch plywood sized to fit all the first floor windows and doors with pilot holes pre drilled to hit the studs. I can have them up inside of thirty minutes should local conditions dictate.
Got a few other surprises for anyone who thinks they can hang around long enough to work their way through the defenses. Just used my imagination.