Against Islamic State, airstrikes may not suffice

It's the modern era's military strategy of choice: overwhelming air power delivering precision-guided punishment backed by intelligence on the ground, with minimal exposure for soldiers of the striking side. Seductive though it is to risk-averse governments with war-weary publics, the approach has its limits — and these are on display in Syria and Iraq, where a U.S.-led coalition has carried out over 4,100 airstrikes against Islamic State radicals yet failed to stop the extremists.

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