The media call almost everything an “existential threat” these days. But the threat from a natural or man-made electromagnetic pulse (EMP) really is one.
North Korea & (probably) Iran are capable now of setting off an electromagnetic pulse that would end modern society & kill millions.
America’s power grid is dangerously vulnerable to cyber attacks or the electromagnetic pulse from a nuclear explosion.
In 1977, when the secretary of the Navy was recruiting to fill a political position, he invited John McCain after learning the details of his heroism at the Hanoi Hilton.