A year ago today, Navy SEALs killed Osama bin Laden, a capstone event in the decade-long war on terrorism. Bin Laden's death, coupled with other setbacks for the terrorist movement he led, has allowed U.S. officials to muse openly about the ultimate defeat of al-Qaida. There's just one problem: U.S. counterterrorism officials do not know how they would know if the terrorist movement is actually destroyed.
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