Professional standing Marine Expeditionary Brigade headquarters and their associated subordinates will be the centerpiece of Marine Corps operations in the future. The Marine Corps needs to reorganize the operating forces to create a single warfighting Marine Expeditionary Force, a Marine Logistics Command, five professional standing Marine Expeditionary Brigades, and six Marine Expeditionary Units (Special Operations Capable). This monograph identifies the need for change. The new world environment, Marine Corps' future concepts, and a redefinition of world conflict are key factors requiring organizational change in the United States Marine Corps. I provide a unique reorganization of the Marine Corps' operating forces to enhance unit cohesion, combat efficiency, and overall Marine Corps / Joint Force capabilities. These improvements include a cost savings of 3635 personnel structure spaces. This monograph directly supports the Marine Corps' family of concepts and programs outlined in the Marine Corps Concepts and Programs 2004. It provides a solution preparing the Marine Corps for the future. It will ensure America's premier Expeditionary Force stands ready when called upon.