Navy fighter jets roar off this nuclear-powered aircraft carrier in support of Iraqi troops approachingRamadi, a city in Anbar Province overrun by Islamic State fighters in one of the worst defeats for the American-led coalition. The six-hour round-trip flights provide air cover for Iraqi troops on the ground as Navy and Marine fighter pilots and weapons officers drop bombs on Islamic State fighting positions. The American airmen destroy large trucks, weapons caches and the fighters themselves. No target is too small: They even strike individual heavy machine guns. And yet, 10 weeks into the campaign to retake Ramadi, it remains in the control of the Islamic State, also known as ISIS or ISIL. Since the fall of the city in May, Iraqi forces have cut off some resupply routes into its center and have advanced to some outlying suburbs. Last week, in large part because of American airstrikes, Iraqi troops dismantled an Islamic State command base. They have retaken the University of Anbar, although American officials are unsure if the entire campus is secure.