Oh, the dangers could be much more mundane than IEDs (besides, you're forgetting that we don't manufacture *anything* here in the US anymore!).
It could be as simple as bridges being blocked. And, the challenge may be to get past those bridges before they get blocked. And part of accomplishing that is not having to stop to eat.
This is where the MREs might come in handy.
Hopefully it never comes to that, but MREs (and a plan) are cheap insurance.
Snicker snicker snicker