The 1940 Ogdensburg Agreement entrenched a formal defence relationship between Canada and the United States – but was Canadian sovereignty upheld? Sovereignty and Command combines historical narrative with conceptual analysis of sovereignty, command and control systems, military professionalism, and civil-military relations to document the sometimes fractious Canada–US continental air defence relationship. Richard Goette argues that a functional military transition from an air defence system based on cooperation to one based on integrated and centralized command and control under NORAD allowed Canada to retain command of its forces and thus protect Canadian sovereignty.