Are Cold War Bunkers, Warning Systems Still Useful?

IN THE MID-1990S, AFTER THE Cold War had come to an end, Hawaii stopped testing its Attack Warning Tone, meant to sound the alarm in the event of a nuclear attack. Why blast an incredibly loud noise each month, when it seemed unlikely to be used?

Now, though, as North Korea keeps testing intercontinental ballistic missiles, the state is revving up its Cold War warning system, with a monthly test. It's just a precaution, according to state officials, but it's hard not to see this move as a very unwelcome blast from the past.