Each of the Korean Army, Navy, and Air Force has plans to build its own Live-Virtual- Constructive (LVC) simulation. To build a LVC simulation environment, it is necessary to link distributed resources and models. However, interoperation with distributed resources and models has many complexity issues, such as designing the communication infrastructure for distributed environment, linking between heterogeneous architectures (e.g. HLA, DIS, DDS etc.), interpreting differences in resolution of models, and overcoming the differences in time advance techniques between models. This paper reports on a method to check whether the communication infrastructure has the capabilities for the distributed LVC simulation environment. We extend the performance assessment method of a gateway in the LVC Architecture Roadmap Implementation (LVCARI) to apply to the Korean force’s operational characteristics and distributed simulation environment. The method proposed consists of three parts: defining performance indices, considering test scenario, and configuring test environment. First, the test scenario generates the test cases in which communication infrastructure is operated. The scenario has some properties, e.g. number of entities, number of interactions, number of transactions in a unit interval, pattern of message generation, and complexity of translation between architectures. Second, performance indices represent how much the communication infrastructure supports the LVC simulation environment. The speed of message transfer has to be high in a small size and highresolution model such as an engagement-level simulation with entity models. However, the speed could be low in a large-scale simulation such as the combined forces simulation with aggregate models. Third, test environment that evaluates the communication infrastructure. As the LVC environment is distributed and has communication devices, the way of collecting statistics and configuration have to consider these aspects. This performance assessment method can be applied to check if the communication infrastructure satisfies the requirements of an LVC simulation environment.