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The United States has repeatedly expressed its reluctance to provide Syria's armed opposition with weapons, due to the fear that they will fall into the hands of extremists groups. At this week's meeting in Rome, the U.S. government promised only to provide non-lethal support. It's time for Washington and the international community to reconsider, because the only way to prevent the rise of warlords and extremist groups is to support the organized Syrian opposition in professionalizing the armed revolution. In fact, the Syrian Coalition, an internationally recognized umbrella group of opposition parties, has made great strides to account for all advanced weaponry under the rebels' control. It now registers and traces all such arms to ensure that only trained officers under the command...