The United States says its war in Afghanistan is over, after the last plane carrying US troops left Kabul airport. Thousands of troops had spent two weeks protecting a hurried and risky airlift of tens of thousands of Afghans, Americans, Australians and others seeking to escape a country once again ruled by Taliban militants. The airport had become a US-controlled island, the last stand in a 20-year war that claimed more than 2,400 American lives. Ashley Townshend, the Director of Foreign Policy and Defence at the United States Studies Centre, spoke with ABC NewsRadio's Jamie Travers.