Napoleon –> Clausewitz –> Hitler.  He was a vigorous writer, Clausewitz, but he was also of his day, and his day was between the horse and the atom bomb.  His vision was of great armies charging across great landscape, and that was far from intrastate, internecine, transnational low-intensity challenge.  Because he viewed war as a great stimulus for invention, he might understand both the world’s extensive defense research and arms industries, but, perhaps, set out in the field, he would be lost and searching the horizon hopelessly for massed cavalry.

I fear being made to go back and retrieve On War from my library (it’s around here somewhere), but I am certain of its diminished relevance as regards the Islamic Small Wars (which I now describe as “intrastate, internecine, and transnational low-intensity conflict”).  Perhaps he would be excited by the appearance of new fields with relevance to conflict studies, e.g., from psycholinguistics to robotics, and, for sure, he would be a fan of the Office of Naval Research and its counterparts worldwide, but I think he would be an office guy working up “what ifs” and gaming while the great fleets circle the glove in something like strategic balance.