Summary: This report discusses the importance of preparing for war (jus ante bellum) by developing and deploying AI-enabled weapon systems in a way that minimizes unjust resort to war and unjust fighting during war. It highlights the need for rigorous testing, evaluation, validation, and verification (TEVV) of AI-enabled weapons, along with a gradual fielding approach, clear operational guidelines, and adequate explainability. It also addresses the potential security dilemma in an AI arms race and recommends confidence-building measures and a careful approach to war preparedness.