This invention are computer implementable programs and method designed as medical planning tool that (1) models the patient flow from the point of injury through more definitive care, and (2) supports operations research and systems analysis studies, operational risk assessment, and field medical services planning. The computer program of this invention comprises six individual modules, including the casualty generation module, which uses an exponential distribution to stochastically generate wounded in action, disease, and nonbattle injuries; a care providing module uses generic task sequences, simulated treatment times, and personnel, consumable supply, and equipment requirements to model patient treatment and queuing within a functional area; a network/transportation module simulates the evacuation (including queuing) and routing of patients through the network of care via transportation assets; a reporting module produces an database detailing various metrics, such as patient disposition, time-in-system data, and consumable, equipment, personnel, and transportation utilization rates, which can be filtered according to the user's needs.