The US Department of Defense invested $330 million to develop 20 of the bombs and requested an additional $82 million to enhance their efficacy, the Wall Street Journal reported in 2012.
In April the Journal reported that the upgraded bomb was tested in mid-January, when it was dropped from a B-2 bomber that took off from Whiteman Air Force Base in Missouri.
The successful test showed a massive bomb that could be guided much like smaller precision weapons and was upgraded with electronic countermeasures that protect it from potential Iranian jamming, which could otherwise be used to steer incoming weaponry off target.
The US officials, who were reportedly not involved in the administration’s negotiations with Iran, told the Wall Street Journal that the bombs, if used, would have a devastating effect never before seen by a non-nuclear weapon.
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