American political theorist Michael Walzer is a prominent provocative thinker on the morality of warfare. His landmark study, Just and Unjust Wars, remains a modem classic. But we might ask: given that this oft–cited work first appeared in 1977, what, if any, relevance does it have for us today? Consider, for instance, Walzer's controversial account of jus ad bellum, a term traditionally referring to the justice of resorting to war.