Here: "The key, of course, will be for the United States to stay engaged as it did in Korea and the Balkans--and not flee as it did in Vietnam circa 1974-5. Only its vigilant presence can ward off potential enemies of nascent American-sponsored democracies. Ambiguity, in fact, is nothing new to American forces abroad that still are not always quite sure of the parameters of independent action in Kosovo after seven years--or even in Korea after 50."