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Pentagon Upgraded Biggest Bunker Buster Bomb as Iran Talks Unfolded
(Wall Street Journal) Julian E. Barnes and Adam Entous - The Pentagon has upgraded and tested the largest bunker-buster bomb in the U.S. arsenal, senior U.S. officials said, readying a weapon that could destroy or disable Iran's most heavily fortified nuclear facilities should a nuclear deal fall apart and the White House decide to take military action. "We have not taken our eyes off the ball," a senior U.S. official said. The most recent testing took place mid-January, when the upgraded bunker buster was dropped at a testing site by a B-2 bomber. Improvements include electronic countermeasures to prevent jamming its guidance systems.