That chart was at the beginning of this year. Now U.S. troop numbers are up to 68,000 and General McChrystal wants more, though it is impolitic to blurt it out.
- You occupy a country for 8 years and your enemies (or anyway some set of people who are pretty hostile) now control more of it than you do;
- Most of the opium that reaches your European allies now comes from that country;
- You hold an election in which one third of the "votes" are suspected of being fraudulent and which many tribal groups assume was illegitimate;
- Your own people and most of your allies no longer see any purpose in prolonging the dying.
Stop it -- now.