Tactical EMS Zonal Framework for Health Security Operations-An Updated Review

Background: High-threat incidents such as active shooter events, terrorism, hazardous materials exposure, and mass casualty incidents pose significant risks to both patients and responders. Emergency Medical Services (EMS) require structured operational frameworks to balance effective medical care with responder safety. The zonal approach—Hot, Warm, and Cold zones—has emerged as a critical model for organizing tactical medical response in dynamic environments. Aim: This review aims to examine the Tactical EMS zonal framework and its application in health security operations, highlighting clinical priorities, operational roles, and evidence-based practices across Hot, Warm, and Cold zones. Methods: A narrative review was conducted of established tactical medicine doctrines, including the National Incident Management System (NIMS), Tactical Combat Casualty Care (TCCC), Tactical Emergency Casualty Care (TECC), and the Hartford Consensus. Zone-specific operational characteristics, medical interventions, and responder safety principles were synthesized. Results: The Hot Zone is characterized by immediate danger, permitting only essential life-saving interventions such as hemorrhage control and rapid evacuation. The Warm Zone allows expanded but time-limited care guided by the MARCH algorithm, often utilizing Rescue Task Force models and casualty collection points. The Cold Zone provides a secure environment for comprehensive assessment, formal triage, definitive stabilization, documentation, and coordinated transport. Integration of TECC principles aligns zone-based care with civilian EMS practice, improving survival while reducing responder risk. Conclusion: The Tactical EMS zonal framework provides a structured, adaptable approach to medical management in high-risk incidents. Clear zone designation, adherence to evidence-based protocols, and interagency coordination are essential to optimize patient outcomes and responder safety.