What is Tactical EMS?
Tactical Emergency Medical Support (TEMS) is the practice of providing prehospital care in tactically challenging environments, including active shooter incidents, law enforcement operations, and other hostile situations. The principles of tactical medicine differ from conventional EMS in one fundamental way: the threat environment changes treatment priorities. In conventional EMS, scene safety is a prerequisite before patient contact. In tactical medicine, the scene may never be fully "safe," and care must be adapted to the threat level.
The Committee for Tactical Emergency Casualty Care (C-TECC) has developed guidelines that adapt military Tactical Combat Casualty Care (TCCC) principles for the civilian EMS environment. These guidelines divide care into three phases based on the threat level, with different treatment priorities in each phase.
The Three Phases of TECC
Direct Threat Care (Hot Zone)
In the direct threat phase, you are under active threat (gunfire, explosions, hostile individuals). The only medical intervention in this phase is hemorrhage control from life-threatening extremity bleeding using a tourniquet. All other interventions wait until the patient can be moved to a safer area. The priority is to move the patient to cover and concealment. Self-aid and buddy-aid are the primary mechanisms; EMS providers typically do not enter the hot zone unless they have tactical training and appropriate protective equipment.
Indirect Threat Care (Warm Zone)
In the indirect threat phase, the direct threat has been suppressed or you have moved to an area with reduced threat, but the situation is not fully secured. In this phase, expand care to include airway management (nasopharyngeal airway, recovery position), needle decompression for tension pneumothorax, wound packing with hemostatic gauze for junctional hemorrhage, and rapid assessment for other life-threatening injuries. Maintain tactical awareness; the threat could return at any time.
Evacuation Care (Cold Zone)
In the evacuation phase, the patient is in a secure area, and care expands to full EMS protocols. Perform a complete assessment, establish IV access, administer medications, manage the airway definitively, reassess all interventions applied in earlier phases, and prepare for transport. Document all treatments and times.
Hemorrhage Control in Tactical Environments
The leading cause of preventable death in tactical situations is extremity hemorrhage. Rapid tourniquet application is the cornerstone of tactical hemorrhage control. Every EMS provider responding to active threat calls should carry a tourniquet on their person (not in the ambulance) and know how to apply it in under 30 seconds. Train with the specific tourniquet your agency carries (CAT, SOF-T, or similar) until application is automatic.
Active Threat Response for EMS
Many EMS agencies now participate in Rescue Task Force (RTF) operations during active threat incidents. In the RTF model, EMS providers team with law enforcement officers who provide security while EMS provides rapid medical assessment and hemorrhage control in the warm zone. RTF members typically wear ballistic vests and helmets. Training for RTF operations should include the TECC guidelines, tourniquet application, wound packing, tactical movement, and coordination with law enforcement. Know your agency's active threat policy and your specific role before an incident occurs.