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Reference.org
Allied Command Operations
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<p>The Allied Command Operations (ACO) is one of the two strategic commands of the <a href="/facts/NATO/dCeTddMY">North Atlantic Treaty Organization</a> (NATO), the other being <a href="/facts/Allied_Command_Transformation/vbDMyvPR">Allied Command Transformation</a> (ACT). The headquarters and commander of ACO is <a href="/facts/Supreme_Headquarters_Allied_Powers_Europe/NbaGtA8f">Supreme Headquarters Allied Powers Europe</a> (SHAPE) and <a href="/facts/Supreme_Allied_Commander_Europe/yYL936KL">Supreme Allied Commander Europe</a> (SACEUR), respectively. </p>