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Reference.org
Operations security
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<p>Operations security (OPSEC) is a process that identifies critical information to determine whether friendly actions can be observed by enemy intelligence, determines if information obtained by adversaries could be interpreted to be useful to them, and then executes selected measures that eliminate or reduce adversary exploitation of friendly critical information. </p> <p>The term "operations security" was coined by the <a href="/facts/United_States_Armed_Forces/NHVsU9Id">United States military</a> during the <a href="/facts/Vietnam_War/W0gfbGTE">Vietnam War</a>. </p>