This paper interrogates the relationship among visibility, distinction, international humanitarian law and ethics in contemporary theatres of violence. After introducing the notions of “civilianization of armed conflict” and “battlespaces”, we briefly discuss the evisceration of one of international humanitarian law's axiomatic figures: the civilian. We show how liberal militaries have created an apparatus of distinction that expands that which is perceptible by subjecting big data to algorithmic analysis, combining the traditional humanist lens with a post‐humanist one. The apparatus functions before, during, and after the fray not only as an operational technology that directs the fighting or as a discursive mechanism responsible for producing the legal and ethical interpretation of hostilities, but also as a force that produces liminal subjects. Focusing on two legal figures—“enemies killed in action” and “human shields”—we show how the apparatus helps justify killing civilians and targeting civilian spaces during war.