Israel needs a 15-ton ‘bunker buster’ bomb to destroy the last untouched nuclear facility in Iran, but only the US has one. Such a powerful weapon – the largest non-nuclear bomb in the US arsenal – is needed because the target, Fordow Fuel Enrichment Plant, is built some 300 feet inside a mountain near the city of Qom, two hours south of Tehran. The heavyweight explosive is known as a GBU-57A/B Massive Ordnance Penetrator and was designed by Boeing for the United States Air Force. Its huge weight means it can only be delivered with a B-2 Spirit stealth bomber...