BAGHDAD: The Islamic State group broke through Kurdish defences in northern Iraq on Tuesday and killed an American service member of the US-led coalition fighting the jihadists, officials said. The service member, whom the Pentagon confirmed was American, was at least the third killed by enemy fire in Iraq since IS overran swathes of the country in 2014. President Barack Obama hailed the 2011 withdrawal of American troops from Iraq as a major accomplishment of his presidency, but American forces have been drawn back into combat in the country against Islamic State.