The Defense Advanced Research Projects Agency (DARPA) is prioritizing the development of trustworthy artificial intelligence (AI) for the Defense Department. DARPA's programs heavily incorporate AI, machine learning, and autonomy. The agency aims to prevent strategic surprises by adversaries and stay ahead in technological advancements. DARPA actively seeks transformative ideas and capabilities from industry and academia, often holding challenges with millions of dollars in prizes. One such challenge is the Artificial Intelligence Cyber Challenge, where large language models are used to identify vulnerabilities in software. DARPA collaborates with leading large language model providers and is focused on areas such as proficient AI, information domain confidence, secure systems, and cyber tools. The goal is to develop AI and autonomy applications that warfighters can trust in critical military situations.