Photo: B&W Pantex/Reuters
This pile of rubble is what remains of the last B53 “bunker buster” nuclear bomb that had been part of the U.S. arsenal. The 4090-kilogram, SUV-size Cold War–era explosive was dismantled late last month. The bomb, which was designed to kill anyone within 29 kilometers of where it was detonated and penetrate strongholds as far as 230 meters underground, was destroyed as part of a U.S. effort to reduce the role of nuclear weapons in its national security strategy.












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