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.
The Pentagon declined to comment on any improvements to the so-called Massive Ordnance Penetrator, or MOP.
The Wall Street Journal reported in 2012 that Pentagon war planners had concluded that the 30,000-pound bunker buster wasn’t powerful enough to destroy certain hardened Iranian nuclear facilities and ordered steps to be taken to upgrade the bomb’s design and guidance systems. In 2013, the Journal reported the weapon was being redesigned.
The weapon was last tested in recent months, including in January, and senior officials say the results show the bomb—when dropped one on top of the other—is now more capable of penetrating fortified nuclear facilities in Iran or in North Korea.
Officials said work on improving the MOP is continuing, but the weapon has performed well in the tests, allaying the concerns officials had two years ago.
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