The US Air Force’s GBU-57 Massive Ordnance Penetrator, used recently in American strikes against Iranian nuclear faciltiies, is the largest and most powerful bunker-busting bomb in history — but maybe not for much longer — because the US Air Force just awarded the contract to build its successor, currently known only as the Next-Generation Penetrator, or NGP. News of this contract award was first announced by New Mexico-based Defense contractor Applied Research Associates, but we first learned of this announcement via The Warzone.