The project “Knowledge Extraction, Machine Learning and other AI approaches for secure, robust, frugal, resilient and explainable solutions in Defence Applications” (KOIOS) will be developed around four main outputs (Simulation framework with performance computing capabilities and reduced complexity; Identification and development of use cases; Definition of a metrics specifically designed for measuring frugality, robustness, resilience; and Development of experiments built on a common protocol ensuring their reproducibility) for enhanced AI usage in defence applications.