The author evaluates a Distributed Interactive Simulation (DIS) system known as LeatherNet to determine its abilities in fulfilling the long term Modeling and Simulation (M&S) goals of the United States Marine Corps. LeatherNet is a DIS compatible, virtual simulation system that is being developed to demonstrate the capabilities of today's simulation technology for military applications. The author developed an evaluation methodolgy that evaluates LeatherNet's ability to enhance traditional Marine Corps training. An evaluation was conducted by subject matter experts at the Marine Corps Air Ground Combat Center, 29 Palms, Ca. Analysis of results show that LeatherNet is effective in enhancing traditional live fire training methods despite its limited development. The author presents lessons learned related to this type of evaluation, and provides recommendations for further research. Additionally, the author recommends actions to be taken by the Marine Corps to optimize the benefits of LeatherNet and similar simulation products.