The purpose of this paper is to describe a concept for an advanced expeditionary fire support system that will provide flexible and responsive support for maritime maneuver warfare. Designed to meet the demands of Operational Maneuver from the Sea (OMFTS) and its supporting concepts of Ship- to-Objective Maneuver (STOM) and Future Military Operations on Urbanized Terrain (MOUT), this concept addresses fire support requirements across the spectrum of conflict from devastating, lethal fires in Sustained Operations Ashore (SOA) to tailored, non-lethal fires in support of Other Expeditionary Operations (OEO) forward-deployed naval expeditionary forces provide the means for the National Command Authorities to respond rapidly to crises across the full spectrum of military operations. They must be capable of operating effectively in any environment against a wide range of potential adversaries. Many such adversaries, even those who are relatively unsophisticated, will be capable of employing modem weapons systems that are more capable in terms of range, accuracy, and lethality than those available today. Our adversaries may have little concern for such protocols as the Hague Convention, which seek to limit collateral damage and noncombatant casualties. Such considerations will always be a factor in the planning and execution of US military operations. Finally, we can never discount the possibility that an adversary will resort to the use of weapons of mass destruction. The Navy and Marine Corps are preparing to meet these challenges through implementation of our warfighting concepts. These concepts take full advantage of the maneuver space provided by the littoral environment by exploiting advances in operational and tactical mobility. The concept for expeditionary fire support addresses the system that will provide flexible and responsive fires in support of Marine forces.