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MARCH provides a structured approach to life threats: (M) control catastrophic bleeding; (A) secure the airway; (R) support breathing and treat chest injuries (seals, decompression); (C) address circulation with shock recognition and resuscitation; (H/H) prevent hypothermia and manage head injury. Prioritizing massive hemorrhage reflects its rapid lethality and relative ease of correction in the field. Airway interventions follow once in relative cover; respiratory assessment includes chest seals and decompression. Circulatory management integrates TXA (per protocol), blood products/fluids, pelvic binders, and reassessment of tourniquets. Hypothermia prevention (active/passive warming) is essential to avoid the lethal triad. Consistent application improves survivability, team coordination, and handoffs. Deviations may be tactically required but should remain anchored to the algorithm to avoid missed interventions during high stress.