The modern battlefield demands rapid access to information to support the effective application of tactical forces. A key element in this process is the collection, analysis, and dissemination of all source intelligence information. To meet these needs, there is increasing use of automation systems supporting the intelligence staff. Such systems require application of COMPUSEC technology to allow flexible and efficient processing of multilevel data while supporting automated interfaces to external systems. The USMC has an urgent requirement to support the processing of multilevel data within the tactical C2 system, particularly in the intelligence mission area. The proposed effort will develop a prototype system which demonstrates the required COMPUSEC technology through the integration of NDI hardware, COTS software, and developmental mission oriented applications. It will also demonstrate the feasibility of implementing near term multilevel operation within the existing IAS system at relatively low cost and risk. The system design will be compatible with the evolving MTACCS architectural requirements.