Afghanistan would have been difficult enough without Iraq. Iraq made it impossible. The argument that had we just focused on Afghanistan we'd now be okay is persuasive, but it omits the fact that we weren't supposed to get involved in nation-building in Afghanistan.In my new book, I open with a quote from Donald Rumsfeld. In October 2001, he said of Afghanistan: "It's not a quagmire." Ten years later there are 150,000 Western troops there.

Look at the violence in Pakistan and the presence of U.S. troops in Afghanistan: the more troops we put in the more violent Pakistan becomes.

Inside the White House there were always extreme amounts of doubt about whether they should be escalating in Afghanistan. In fact, most of the president's advisers said, "This is probably not going to work." A lot of people in the military said, "This is probably not going to work."

The guys on the ground are the guys I care about. I've had the most satisfaction telling their stories. But when you're in combat with somebody, yes, a bond does grow.

The humanitarian argument is so selective I find it difficult to swallow. It's not even so much about the choice as to where we should get involved and where we shouldn't. The minute you start arming people in these conflict zones, like Iraq and Afghanistan, things don't go as expected.

Even on just the career level for your average officer, there's no incentive to end the wars. There's not even an incentive for these think-tank guys to end the wars. They would never admit it and say, "Oh, how could we at the Center for a New American Security not want the wars to end?" Well then, why the hell are you continuing to promote strategies that will keep us fighting for years?

The fact is, psychiatric help is not widely available to CIA agents - and as in the military, there is a stigma attached to admitting post-traumatic stress.