This document discusses principles of combat casualty care, including: 1. The goals of Tactical Combat Casualty Care (TCCC) are to save preventable deaths, prevent additional casualties, and complete the mission. 2. About 60% of combat deaths are from hemorrhage from extremity wounds, 33% from tension pneumothorax, and 6% from airway obstruction - all largely preventable causes if immediate lifesaving interventions are provided on the battlefield. 3. There are three categories of casualties - those who will live regardless, those who will die regardless, and those who could be saved by timely intervention to stop hemorrhage, relieve airway obstruction, or treat tension