In response to the escalating cyber threats faced by military networks, particularly highlighted by a recent breach impacting the UK Ministry of Defence, there is a pressing need for improved cybersecurity measures. The defence sector is challenged by legacy systems, a shortage of cybersecurity talent, and the complexity of integrating new technologies with existing infrastructure. A unified security approach is proposed, leveraging AI to enhance threat detection and streamline operations, reducing the time from threat identification to response. AI tools like Retrieval Augmented Generation (RAG) and AI Assistants help manage the high volume of alerts, offering actionable insights and allowing security personnel to focus on strategic tasks. This integration not only improves situational awareness but also reduces operational costs, enabling more efficient and secure interoperability between legacy systems and modern networks. The adoption of AI-driven platforms is positioned as a necessary evolution to achieve decision superiority and enhance cyber resilience in the defence sector.