Some years ago my mother went on an anthropology field dig in the desert, on a government site. I remember feeling really scared the whole summer that she wouldn't come home, because they had her working in an old minefield that hadn't been deactivated. But they had a security detail with them that guided them safely through the mess. There are places all over that site (and other, more publicly accessible areas, too) that are littered with wartime explosives, leftovers from testing and training. You hear about shells being uncovered from time to time after a wildfire in the Boise foothills, even.
Putting in a little prayer tonight for those families. Any idea how many of those munitions are still out there?