Note the authors are a "who's who" of some of our great thinkers, generals, theorists, practitioners, and historians (well I guess Ambrose has had his issues!). Given the recent comparisons between Afghanistan and Vietnam I recommend one article in particular by the eminent strategist and mentor to so many of us, Colonel (Ret) John Collins' article from 1978 - Vietnam Postmortem: A Senseless Strategy. COL Collins' article should probably be mandatory reading for decision makers before we embark on any future Afghanistans or Iraqs so we do not have a failure to learn, failure to adapt, and failure to anticipate again (a dream of fantasy I know!).
The latest posted issue of Parameters (Winter of 2010-2011) is probably well worth reading because we most likely have not learned well our lessons from the past (What did Cohen and Gooch say about military failures in their book Military Misfortune -- all military failures can be attributed for failure to learn, failure to adapt, and failure to anticipate).