Staying Longer: US Might Keep Thousands of Troops in Afghanistan Past 2016:
Some officials worry that withdrawing too many troops could put the Afghan government under a greater threat from the Taliban and other militants. Others believe the government could still operate effectively with support from a smaller force of several thousand Americans.
Casting a shadow over the debate is the role the Iraq withdrawal of 2011 had in the rise of the Islamic State terror group. Some officials believe the Iraqi military would have been more equipped to hold off the Islamic State’s advance last year if United States kept at least several thousand advisers in the country.