Abstract: The Korean Agency for Defense Development (ADD) has been developing a Republic of Korea (ROK) Command Control Communications and Intelligence (C³I) Master Plan to address South Korea’s C3I architecture including Automated Data Processing (ADP) support. Information about the ROK’s theater-level Command and Control (C²) information management system is described in this study. The ROK government is developing or conceptualizing a ROK national C² ADP system. The system would provide operational information management support to the ROK national-level C² organizations as well as to the tactical-level commanders. The potential interactions and information exchange between the existing and planned ADP systems and US commanders would be an important part of the combined interoperability consideration. The ROK ADP system is reflected in this study as a potential future ROK national security.