 As to the philosophical foundations of just war theory: the traditionalist and revisionist positions are now well staked out. But the really interesting questions that remain to be answered should be approached without thinking in terms of that split. Most notably,  political philosophers may have something more to contribute to the just war theory debate. It would be interesting, too, to think with a more open mind about the institutions of international law (nobody has yet vindicated the claim that the law of armed conflict has authority, for example), and also about the role of the military within nation-states, outside of wartime (Ryan 2016).