Quotes by U.S. Marine Corps

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The first requirement is to establish what we want to accomplish, why, and how. Without a clearly identified concept and intent, the necessary unity of effort is inconceivable.
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In practical terms, this means that we must not strive for certainty before we act, for in so doing we will surrender the initiative and pass up opportunities.
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The task describes the action to be taken while the intent describes the purpose of the action.
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The essence of the problem is to select a promising course of action with an acceptable degree of risk and to do it more quickly than our foe. In this respect, “a good plan violently executed now is better than a perfect plan executed next week.
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We must therefore be prepared to cope – even better, to thrive – in an environment of chaos, uncertainty, constant change, and friction.