From The Danger Room:
North Korea may be readying another nuclear test — one of many reasons why the Pentagon is stepping up efforts to neutralize hardened bunkers, packed with weapons of mass destruction. It’s a tricky problem; to do it, you need something out of the ordinary. Which is why the U.S. Defense Threat Reduction Agency has an ambitious goal of developing a bunker buster five times as strong as the current models by the end of the year, and ten times more powerful by 2013. They’re doing it with a combination of improved guidance, “novel payloads”… and much bigger bombs.
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My Comment: These weapons are being built for a reason .... U.S. military planners are indicating to the leadership that these are the tools that they would need to neutralize the type of hardened targets in North Korea or Iran.