The map is pretty useless, and the analysis by the mapmakers was brainless.
This comment at the end of the article pretty much sums it up. What kind of wet-brained fool would try to figure anything out about the social origins and culture of the military by looking at where the bases are? Richard Florida, that's who! *facepalm* Honestly, the more I see by this guy, the less impressed I am. Commenters do an excellent job of ripping the article to shreds and suggesting more intelligent ways of looking at the question; maybe you should just read the comments first and skip the article.