I just had a chance to talk with three senior Obama administration officials. In regards to President Obama's statement that "after 18 months, our troops will begin to come home," I asked for clarification on how many troops would be coming home in eighteen months, and at what rate would they be coming home.
The answers made it clear that there is no actual timeline for withdrawing troops from Afghanistan:
There is no defined rate for, or number of troops involved in, the 2011 withdrawal.
They will be "taking conditions on the ground into account" in determining the withdrawal.
The withdrawal is "a goal."
That is not a timeline. At best, it is a message to the Karzai government that the Obama administration doesn't want to stay in Afghanistan indefinitely. However, there was plenty of room open in the response that they could stay there indefinitely, given the vagaries of the timeline.
If there was one hopeful bit in the discussion, it was the strong impression that there is a real debate taking place within the Obama administration about the rate and scope of withdrawal in 2011. While is far from a guarantee that the troops will actually start coming home in 2011, but it is at least a sign that they might start coming home at that time.