The document outlines the critical intersections between urbanization, biosecurity, and national security policy, emphasizing the risks posed by megacities and complex systems to public health and stability. It highlights the urgent need for robust public health infrastructure and innovative responses to emerging infectious diseases exacerbated by global urbanization and environmental changes. The author calls for a reevaluation of military capabilities and training to address the complexities of operating in densely populated urban environments amid escalating biosecurity threats.