A Capabilities-Based Assessment chartered by the Commanding General, Training and Education Command identified the Live, Virtual, Constructive – Training Environment (LVC-TE) capabilities required by the United States Marine Corps (USMC). These capabilities enable the LVC-TE to create a common environment for units to train across LVC domains as though located in the same battlespace and, “provide the means to conduct realistic, collaborative training and exercise of warfighting functions� (Initial Capabilities Document, USMC, 2010). Subsequently, Training and Education Command (TECOM) required assessments be conducted for simulation training systems used in an LVC-TE intended to address recommendations identified by Marine Requirements Oversight Council Decision Memorandum and developed further by an LVC-TE Working Group. Special Operations Command followed on these recommendations and consequently requested that Headquarters, Marine Corps include the Marine Corps Special Operations Command requirement for Special Operations Terminal Attack Controller training in this effort. Thus, through collaboration with Program Manager Training Systems (PM TRASYS), TECOM, Naval Air Warfare Center Training Systems Division (NAWCTSD), Marine Corps Tactics & Operations Group, Lockheed Martin (LM), and Instructional Systems and Engineering contracted support, a team was assembled to design, develop, implement and evaluate a unique and ambitious Distributed Mission Training Environment (DMTE). This paper first describes the three currently fielded training devices whose capabilities to support training objectives (tasks associated to Training and Readiness events) were assessed to determine suitability for inclusion in the DMTE then the methodology of the DMTE evaluation. This paper then details the Systematic Team Assessment of Readiness Training (START) process that was employed to confirm and illustrate the capability of the training devices to provide value added training in the DMTE. Results, analysis and the most salient lessons learned are then presented. Finally, the projected movement forward of this DMTE effort is briefly described.