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How to destroy ISIS before it spreads

Targeting an ideology is complex, and the answer cannot be bounded by a conventional military response. But recent history does give us some clues.

A resident of Tabqa city waves an Islamist flag in celebration after Islamic State militants took over Tabqa air base, in nearby Raqqa city, August 24, 2014.
A resident of Tabqa city waves an Islamist flag in celebration after Islamic State militants took over Tabqa air base, in nearby Raqqa city, August 24, 2014.REUTERS

Michael Kay