Should the US decide to send in military forces to secure Iran’s uranium stockpile, it would be a complex, risky and lengthy operation, fraught with radiation and chemical dangers, according to experts and former government officials. US President Donald Trump has offered shifting reasons for the war in Iran but has consistently said a primary objective is ensuring the country will "never have a nuclear weapon." Less clear is how far he is willing to go to seize Iran’s nuclear material. Given the risks of inserting as many as 1,000 specially trained forces into a war zone to remove the...