Duh! Close enough.
Or maybe deflected by accidental artillery fire? Didn't we expend a lot of old ordnance in the first Iraq war including such used in "Iowa-class" battleships? Oh, what to do with old explosives during times of peace. Cruise missiles are full of electronics. As such, these can be temperamental. I've had spiders get into smoke detectors and set them off. Who knows what goes on in weapons storage facilities. You can't really test drive every one of these before sending them on their one and only mission.