"Tuesday's hearing began with opening testimony from Mr Austin, followed by Gen Milley, who said it would now be harder to protect Americans from terrorist attacks from Afghanistan.
"The Taliban was and remains a terrorist organisation and still has not broken ties with al-Qaeda," he said.
"A reconstituted al-Qaeda or ISIS [Islamic State group] with aspirations to attack the US is a very real possibility, and those conditions to include activity in ungoverned spaces could present themselves in the next 12-36 months.""
http://www.bbc.co.uk/news/world-us-canada-58719834