What are the boundaries of "the canon of national security discourse"?

Indeed, is there "a canon of national security discourse"? And if so, did the utterances of G.W. Bush et al. fit into it?

Since I don't have time to address this (or much of anything else) right now, it's lucky that I can simply refer to this post and the accompanying comment thread (which most people here probably have seen already, but in case you haven't...).