TECC stands for Tactical Emergency Casualty Care, a set of medical guidelines designed to help civilian first responders treat injured people in dangerous, high-threat environments like active shooter events, building collapses, or hazardous material incidents. It is maintained by the Committee for Tactical Emergency Casualty Care (C-TECC) and provides a structured framework for delivering trauma care when the scene itself poses ongoing risk to both patients and rescuers.
How TECC Differs From Military Combat Medicine
TECC grew out of a military system called TCCC (Tactical Combat Casualty Care), which has saved countless lives on the battlefield. But TCCC was built around specific assumptions: the patient is a healthy 18-to-45-year-old soldier, the provider operates under a military scope of practice, and a military medical support chain is available. Many TCCC recommendations, such as certain IV fluids, pre-hospital antibiotics, and chest decompression performed by non-medical personnel, run counter to civilian medical standards and legal requirements.
TECC adapts those battlefield lessons for the realities civilian responders actually face. The patient population is far broader, including children, elderly people, and individuals with chronic medical conditions. The legal environment is different: civilian responders work under state and local scopes of practice, carry liability concerns, and operate under use-of-force rules that differ fundamentally from military rules of engagement. And the mission itself is different. Military operations focus on gaining or holding territory. Civilian operations are rescue operations, with the primary goal of limiting death and injury among bystanders and casualties.
Because of these differences, TECC is not a one-size-fits-all protocol. It is designed to be adapted by each agency based on its provider training levels, local scope of practice, patient population, and risk profile.
The Three Phases of TECC
TECC organizes care into three phases, each defined by how much danger is still present. The idea is simple: what you do medically depends on how safe the environment is at that moment.
Direct Threat Care (Hot Zone)
This is the most dangerous phase. Providers may be under active fire, inside an unstable structure, or in a space contaminated by hazardous materials. The goals here are to neutralize or avoid the threat, prevent casualties from being injured further, and keep the response team focused on stopping the danger.
Medical interventions during this phase are minimal by design. The primary medical action is applying a tourniquet to stop life-threatening bleeding from an extremity. If a tourniquet isn’t available or can’t be applied safely, the casualty may be directed to press on the wound themselves. Beyond hemorrhage control, providers may position a casualty to protect the airway, but that’s largely it. Triage is deferred. Detailed patient assessments wait until later.
Extraction is a major priority. If a casualty can move to safety on their own, they should be told to do so. If they’re unresponsive, the scene commander weighs whether a rescue attempt is feasible given the available personnel and the ongoing threat. The guidelines emphasize that threats are dynamic and require continuous reassessment.
Indirect Threat Care (Warm Zone)
Once a casualty reaches a position of relative safety, such as behind solid cover or in an area that has been cleared but not fully secured, providers shift into a more thorough assessment. This phase follows a priority sequence known by the memory aid MARCHE: Major hemorrhage, Airway, Respirations (breathing), Circulation, Head injury and Hypothermia, and Everything Else.
This sequence reflects decades of military medical evidence on what actually kills trauma patients in the field. Massive bleeding is addressed first because it is the leading preventable cause of death. The provider then works through airway management, breathing problems like a collapsed lung, signs of shock, head injuries, and body temperature loss, in that order. This is where the bulk of life-saving field medicine happens.
Evacuation Care
The final phase begins when the casualty is being moved toward a hospital or definitive care facility. Most of the interventions at this stage look like standard emergency medical services. The key emphasis is on reassessing everything that was done in the earlier phases (checking that tourniquets are still effective, that airways remain clear) and aggressively managing hypothermia, which is a serious threat to trauma patients and worsens blood clotting and survival outcomes.
Who Uses TECC
TECC guidelines are used by a wide range of civilian agencies, including law enforcement tactical teams (SWAT), fire and rescue services, emergency medical services, and civilian tactical medics. In the years since mass casualty events became a more prominent concern in the United States and internationally, TECC training has expanded well beyond specialized units. Many standard EMS and law enforcement agencies now incorporate TECC principles into their response planning for active threat events.
The guidelines are also used as a foundation for public-facing programs that teach bystanders basic bleeding control. The logic is the same: in the minutes before professional responders arrive, a tourniquet applied by a nearby person can be the difference between life and death.
How TECC Guidelines Are Updated
The C-TECC is a group of civilian medical professionals, tactical operators, and researchers who review the latest evidence and update the guidelines periodically. The most recent published version is dated 2025. Updates typically reflect new evidence on hemorrhage control devices, airway management techniques, and other trauma interventions, translated into recommendations that work within civilian operational and legal constraints.