If you polled the military in Afghanistan as to how many think we should be there or not, the numbers would probably be similar to what the U.S. population believes. That's not because they're watching the news. But, hey, they are out there risking their lives. No one likes to be criticized and it really sucks to be criticized when you're risking your life.

A soldier in Iraq said that he wanted to "punch Donald Rumsfeld in the gut, then in the face" or something like that. He wanted me to use his name, but I knew he'd get in trouble, so I didn't. However, I felt it was a great quote because it summed up the frustration of those guys at that moment.

Johnny Apple, a New York Times correspondent, wrote a front-page story saying Afghanistan could be a quagmire and he was mocked and derided. What is certainly true is that all sorts of resources that would have been used in Afghanistan were diverted to Iraq. Would those resources have helped? Almost undoubtedly. Whether or not Afghanistan would be a peaceful nation-state had we not gone into Iraq I doubt. Afghanistan is going to be Afghanistan, no matter how hard we try to make it something else.

It was interesting watching the Afghanistan war review deliberations, this three-month process where Barack Obama did the most thorough foreign policy review ever by a modern American president. Compare that to Libya. For a month he said we weren't going to do anything, then suddenly changed his mind and did it on the fly. My view is that it's not how long or quick you take to make a decision, it's whether you make the right one.

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.

I did an embed in Afghanistan on the Pakistan border in 2008. One of the things you realize when you're talking to low-ranking enlisted men is that no one listens to them. So when I showed up they loved having someone to talk to. That's a real privilege for me. The guys on the ground are the guys I care about. I've had the most satisfaction telling their stories. There is trust and there is stuff that you learn to hold back, especially when you're dealing with younger guys or lower ranking officers. That's different from the top brass who are basically just politicians anyway.

The idea of aerial military surveillance dates back to the Civil War, when both the Union and the Confederacy used hot-air balloons to spy on the other side, tracking troop movements and helping to direct artillery fire.