Colonel Creighton's command provides an excellent case study in the leadership of coalitions, which are critical to the United States now and in the future. The U.S. military's mission in Afghanistan enjoyed significant legitimacy because it operated within a coalition that was based on international mandates from the United Nations and the North Atlantic Treaty Organization (NATO). These mandates enabled unity of purpose among the more than 50 nations that joined the Coalition and sustained that unity for more than 20 years. Coalitions enable the sharing of burdens among troops, funding, equipment, and civil, humanitarian, and development support. When legitimacy is firmly established, political leaders can more easily generate domestic support and secure precious resources. Coalition members contribute within their unique capabilities, and as a result, the whole becomes greater than the sum of the parts. The unity enabled by legitimacy creates political and military options that are not possible when nations act unilaterally. Ultimately, this unity among the United States and its allies and partners will be essential to prevail in the strategic competition vis-à-vis China and Russia.