Good question. I think something to keep in mind, the US hasn't fought a war on the home front since 1865. The Spanish American war, WWI and WWII, Vietnam, Ko

Good question. I think something to keep in mind, the US hasn't fought a war on the home front since 1865. The Spanish American war, WWI and WWII, Vietnam, Korea, the Gulf war, Afghanistan, Iraq - none of these were fought on American soil, with the exception of Pearl harbor, which was a navy base, not a major manufacturing site. So we haven't really had to reckon with what happens if our homeland is under fire - sure, we drilled for it during WWII, worrying about Nazi bombers and Japanese sabotage but neither actually happened. It doesn't look like our wars are going to get closer anytime soon, but modern planes and rocketry have much greater range than in the 1940s the last time we were at war with countries with significant resources. If we ever come head to head with China, their missile capabilities could be a real concern.