Abstract: We study an amphibious operation involving the US marine for combined forces in Korea and the Advanced Combat Direction System (ACDS) and command and control Automated Data Processing (ADP) systems. The ACDS which was proposed in the late 1970’s is a centralized, automated command-and-control system and it upgrades the NTDS for aircraft carriers and large-deck amphibious ships. Former NTDs collected information from ship’s active and passive sensors, correlates hostile tracks and provided an integrated display of air, surface and subsurface situations for the ships operations officer. The NTDS was located in the ship’s combat information center. There are two basic steps to the upgrade of the Combat Direction System (CDS) systems currently employed on ships. We discuss two basic steps and amphibious operations for combined forces in Korea. The rogue North Korean regime is plowing ahead with its missile technology and there are escalating threats in Korea Peninsula. US and ROK combined forces may decide to establish a functional component command to integrate planning and to improve combat efficiency significantly by use of amphibious operations. The ACDS replaced the NTDS (Naval Tactical Data System) due to growth in operational requirements both in the areas of combat direction needs and Battle Group/Battle Force (BG/BF) command and control. An amphibious operation is a military operation which uses maneuver principles to transition ready-to-fight combat forces from the sea to the shore in order to obtain an advantage over a hostile nation. Interoperable information systems to provide timely dissemination of information for amphibious planning, rehearsals and execution are required. Amphibious operations require a flexible communications system to support rapid decision making and to maintain a high tempo of operations. It must be reliable, sufficient for the mission, flexible, sustainable and survivable.