US Vice President Joe Biden said on Saturday that America's role in Iraq was switching from deep military engagement to one of diplomatic support, ahead of a complete withdrawal from the country in 2011. He told newly sworn-in American citizens, mainly soldiers, that the United States had honoured its June 30 obligation to withdraw troops from Iraq's towns and cities and the focus was now on strengthening political ties. "You have lost comrades, 4,322 fallen angels, over 30,000 wounded -- 17,000 critical, but because of your ...