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The U.S. Air Force has deployed an upgraded version of the country’s largest non-nuclear bomb — a 30,000-pound “bunker-buster” that can only be carried by the B-2 stealth bomber and could be used against adversaries such as North Korea.

A fourth upgrade to the Boeing Co. bomb, the GBU-57, has been completed and the existing inventory is being retrofitted, Capt. Emily Grabowski, an Air Force spokeswoman, said in an email. The modification “has improved the performance against hard and deeply buried targets,” she said.

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