I just don't know whether it was all destroyed years ago - I mean, there's no question that there were chemical weapons years ago - whether they were destroyed right before the war, (or) whether they're still hidden.

Fighting in cities is a totally different endeavor than obviously fighting out in the open.

I did a week-long assessment in 2005 at (then Defense Secretary Donald) Rumsfeld's request. Following our return, I told him that Afghanistan was going to be the longest campaign of what we then termed "the long war."

Pakistan are very keen to carry out the operations themselves. And there's significant effort on the part of the US and other countries to provide assistance that can enable Pakistan to do just that.

If you don't want to have to kill or capture every bad guy in the country, you have to reintegrate those who are willing to be reconciled and become part of the solution instead of a continued part of the problem. And then, above all, the resources.

President Obama has said that our aspirations should be realistic. We are not going to turn one of the poorest countries in the world, that was plunged into 30 years of war, into an advanced, industrialized, Western-style democracy. What we want to achieve is Afghanistan's capacity to secure and govern itself.

First and foremost is to not allow the reestablishment, if you will, of an extremist sanctuary that can export the kind of terror that ended up with terrorists taking down the World Trade Center and plowing into the Pentagon and a field in Pennsylvania. That's the point: We started this war because the Sept. 11 attack came from this area. And we do not fight alone, but with some 40 allies who share that view.