Abstract: Command, control, and communications (C3) are essential to the conduct of military actions: embodying the legal authority to direct forces; facilitating the administration and management of resources; and enabling the coordination of efforts towards achieving purposeful effects. This paper investigates past, present, and proposed C3 systems and structures enabling the Australian Defence Force (ADF) to develop, operate, and evolve a C3 capability for service in the 2016 timeframe. Results of this study will inform the development of a future integrated C3 capability for the ADF.