Isn't the US war in Afghanistan over?

If this is true, then the Taliban's task is not over:

http://article.wn.com/view/2013/05/05/Seven_US_troops_killed_in_Afghan_bomb_insider_attack/#/related_news

And what irks them to greater heights of fury is that their dear Hamid Kasai is a self-admitted paid agent of the the American CIA.