The United States is moving rapidly to replenish its stockpile of GBU-57 “bunker buster” bombs as tensions with Iran escalate during sensitive nuclear negotiations. Reports say the U.S. Air Force awarded Boeing a sole-source contract worth over $100 million to produce new Massive Ordnance Penetrators, aiming to replace weapons used during last year’s strikes on Iran’s deeply buried nuclear sites. The contract highlights Washington’s urgency to maintain readiness, even as Tehran claims unexploded GBU-57 bombs remain lodged inside its facilities — raising fears Iran could recover them for intelligence and engineering insights. Supreme Leader Ali Khamenei’s warning about Iran’s “secret weapon” adds to the pressure, while Israel pushes for tougher action if diplomacy collapses.