How Islamic State Keeps Its Head, Even When It Loses Leaders

The killing of senior commanders will not overthrow ISIS, which, despite fierce internal conflicts, has managed to conduct a complex military and political campaign

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Prior to his death after a U.S. Air Force attack in Iraq last week, Saud Mohsen Hassan had quite a number of aliases – Abu Mutazz, Abu Muslim al-Turkmani and Fadel al-Hayali – and also quite a number of roles....