Who is responsible for Responsible AI (RAI)? As the Department of Defense (DoD) invests in AI workforce education, this question serves as starting point for an argument that effective training for military RAI demands focused character development for officers. This essay makes that case in three parts. First, while norms around responsibility and AI are likely to evolve, there remains long-standing legal, ethical, and practical precedent to think of commissioned officers as the loci of responsibility for the application of military AI. Next, given DoD’s emphasis on responsibility, it should devote significant pedagogical attention to the subjective skills, motivations, and perceptions of operators who depend on AI to execute their mission, beyond merely promoting technical literacy. Finally, the significance of character for RAI entails the application of proven character development methodologies from pre-commissioning education onward: critical dialogue, hands-on practice applying AI in complex circumstances, and moral reminders about the relevance of the DoD’s ethical principles for AI.