Apparently, it was dropped on a tunnel system in Afghanistan, and possibly in retaliation for the death of a Green Beret.
It sort of remind me of this scene from the first season of The West Wing:
I don't want to get bogged down in nation-building in Afghanistan again, but hey: It's also not the worst thing to kill a bunch of ISIS guys with a big ol' bomb if we're already killing them with bullets. Zero US casualties from dropping giant bomb today.
It also might have the side-effect of showing the crazy guy in North Korea that we might just drop one of these on him if he gets out of line.
I also like the idea that if we lose a guy - one guy- the enemy loses an entire mountain. Utter destruction. A dis-proportionate response.
Civis Romanus Sum.