here's a quick preview. >> $2 trillion. thousands of lives loxts was the war worth it? >> before i go to my grave, i want that question answered. >> what went wrong in afghanistan? >> i don't think we had a good definition of winning. >> corruption was one of the reasons of how things turned out. >> was pakistan our enemy? >> no. but pakistan was that our friend. >> the tough questions that still need answers. if everybody gets an "a" but the overall effort is still an fmpbl, who do we hold accountable?