In Marine Corps tactical training, small unit leadership, and survival instruction, the rule of three is a foundational concept used to prioritize physiological survival needs and tactical planning. Physiologically, it outlines human survival limits: three minutes without air, three hours without shelter in extreme environments, three days without water, and three weeks without food. In combat leadership and tactical operations, variations of the rule guide fire team spacing, communication checks, and three-tiered fallback contingencies to ensure operational resilience and mission success.
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