Abstract : The Tactical Medical Logistics Planning Tool (TML+) is a software program designed for Navy and Marine Corps medical planners as a simulation tool that models the flow of patients from the point of injury (POI) through more definitive care, and an operations research tool that supports systems analysis, operational risk assessment, and field medical services planning. TML+ incorporates extensive data for over 400 patient conditions and their corresponding medical treatment tasks, treatment times, equipment and consumable supplies, transportation assets, medical personnel and required skills, and medical capabilities. It simulates patient losses due to treatment delays and medical complications in order to assess the impact that resource limitations, system bottlenecks, skill limitations, and other factors have on their medical outcomes.