Planning a military deployment is a complex, multi-phased problem. Depolyment planners must consider the constraints, options, and available infrastructure at each installation, from the beginning of the transportation system in the United States to the end of the deployment in the host country. The Military Transportation management Command Transportation Engineering Agency (MTMCTEA), in collaboration with Argonne National Laboratory (Argonne), developed the Transportation System Capability (TRANSCAP) model to simulate deployment of forces from army bases. TRANSCAP uses sophisticated simulation processes to conduct detailed analyses, plan real-world operations, and train army transportation specialists. TRANSCAP's design separates its pre- and post-processing modules (developed in Java) from the simulation module (developed in MODSIM III). The pre-processing module uses a graphical user interface (GUI) to manage database and geographic information system (GIS) linkages and to create, modify, and display simulation scenarios. The post-processing module displays the simulation results in reports and graphs. The simulation module contains the heart of TRANSCAP, the discrete-event simulation (DEVS).