Another thing to consider is that one of the executive orders that dear old GW signed allowed for the seizure of all food stocks, fuel, firearms, and vehicles in the event of Martial Law being declared. Once that happens, you had better be where you were going because there will be no travel allowed. I think that a good rule would be to pack a few essentials in an A.L.I.C.E. pack, have one rifle with a couple of hundred rounds of ammo (no matter how many you've stashed), a good pair of boots and woods basics, and a good SW emergency radio ready to roll on 20 minutes notice. Scout the area that you will flee to and make certain that you can navigate the route in the dark. Leave no notes, maps, scribbles, etc. and throw the cellphone in the trash after you've disconnected the battery.
Seems like the bottom line is that there's no guarantee you'll survive any collapse or attack from inside or out. Best you can hope and pray for is to be able to survive most of the different scenarios, including the one in which nothing ever happens: while you're alive, enjoy life in this great country, and keep faith in its people and its soldiers and your childern - that it will endure.