When the US dropped a 22,600-pound bomb near suspected ISIS tunnels in Afghanistan’s Nangarhar province on Thursday, the blast from the explosion would have rushed into the furthest reaches of the mountain complex about a mile away. The GBU-43, known as Moab—short for Massive Ordnance Air Blast, or, colloquially, Mother of All Bombs—is the largest non-nuclear, non-penetrating bomb in the US arsenal. And until now, this mother had never been used outside of a testing facility.

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