The Obama administration is debating how many service members it should aim to keep in the country after the U.S. combat mission ends at the end of 2014.
Asked about consideration of a so-called zero-option once the NATO combat mission ends at the end of 2014, Rhodes said: "That would be an option that we would consider".
And, will the international troops be able to transfer all authority to the Afghans at the end of 2014, when the International Security Assistance Force mission ends?
Their combat mission ends on 31 December.
When a mission ends in catastrophe, they write their own evaluations.
These forces could remain in the country well after the NATO mission ends in late 2014.
But there are just 22 months until the American-led combat mission ends in December 2014.
If it is destroyed, the mission ends and you will have to restart from the beginning.
Mr Danforth's mission ends in March, and he has made it clear that he will go home.
"To me, Isis is an Iranian-American project and, when its mission ends, Isis may leave the region," he says.
Mr. Wolfowitz said the Bush administration was considering several options after the six-month training mission ends on July 31.
