Distributed Interactive Simulation (DIS) has recently received widespread acceptance in the DoO community as the standard for networking simulations. Although DIS has its roots in interfacing virtual simulations (entity level, typically man-in-the-loop training), it is also being adapted for use with constructive simulations (wargame and analysis) and live simulations (real, fielded equipment). This paper describes a DIS network combining live constructive and virtual simulations. The live simulation components, provided by fielded command and control equipment, were able to interact with a constructive simulation called CIMUL8â„¢ and a part task trainer (virtual simulation) for training in Multiple Launch Rocket System (MLRS) Fire Control Panel operations. Besides providing the first demonstration of its kind, this configuration was used for the purpose of evaluating a new training system (the MLRS Fire Control Panel Trainer (FCPT)) using real equipment inputs as well as inputs from a constructive simulation representation of the real equipment. The paper will describe the design of the evaluation, present some preliminary training evaluation results, and make recommendations for future use of the system for evaluation. The paper will also recommend additions to the DIS standards for better support of similar test systems.