Foreign Minister Zavad Zarif said last week to students at a Tehran university that a US military attack could paralyze Iran’s defensive system. Revolutionary Guards commander Gen. Mohammed Ali Jafari countered that the foreign minister “has no expertise in the field of defense” and his comment was incorrect. Speaking at another Tehran university Tuesday, Jafari also said the US could only destroy up to 20 percent of Iran's missile capability if it bombs the country heavily, according to a report by the semiofficial Fars news agency.