And the latest strategy of pull back and fortify safe zones, is a painful repeat of the "Fortified Hamlet" strategy that failed so miserably in Viet Nam.
Oh, but don't take my word for it, Here is a link to the Nov-Dec 2009 issue of Military Review, the professional journal of the US Army. Have a look at the article entitled Refighting the Last War: Afghanistan and the Vietnam Template. (MR asks that we link to the index, rather than directly to the article itself)
Please observe that this article is extensively footnoted; there are no wild, undocumented claims here.
Oy! I could go on, but I've said it all before.