Have US counterterrorism efforts improved since 9/11?

A New York City Police Department (NYPD) officer pauses at the edge of the reflecting pool at the National 9/11 Memorial and Museum during ceremonies marking the 16th anniversary of the attacks in New York, U.S., September 11, 2017. REUTERS/Brendan McDermid     TPX IMAGES OF THE DAY - RC191F4FEB50
Editor's note:

This conversation was recorded remotely by phone call

Ahead of the anniversary of the September 11 terrorist attacks, Senior Fellow Daniel L. Byman reflects on what has gone well and what has gone poorly in US counterterrorism efforts in the seventeen years since the attacks.

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