The document provides guidance on tactical combat casualty care (TCCC) for medical personnel operating on the battlefield. It outlines three stages of care - care under fire, tactical field care, and tactical evacuation care - with different objectives and limitations for each. During care under fire while still exposed to hostile forces, the priorities are suppression of fire, moving the casualty to cover, and treating life-threatening hemorrhage, primarily through use of tourniquets for bleeding extremity wounds. Airway management and other interventions are deferred until tactical field care once the rescuer and casualty are safe from fire. The document emphasizes that the leading cause of preventable battlefield death is hemorrhage, so controlling bleeding takes precedence over other medical