The Marine Corps' Combined Arms Command and Control Training Upgrade System (CACCTUS) is a transformational program that will add significant enhancements to the all aspects of Marine Air Ground Task Force (MAGTF) training. CACCTUS will enable comprehensive Marine Corps staff, unit, and individual training across the Live, Virtual, and Constructive (LVC) training realms through the incorporation of all appropriate Command, Control, Communication, Computers, and Intelligence (C4I) architectures and equipment. Further, CACCTUS will facilitate multi-echelon as well as distributed training opportunities, thereby increasing the breadth and scope of future training events. Also, CACCTUS will incorporate links to and from the live training environment, to include robust capture and display of events for detailed after action review. This paper describes the capabilities that CACCTUS will bring to the Marine Corps and how it will further Marine Corps Training Transformation.