NYPD trains on 'Boardwalk Empire' set

3 of 5: The producers of HBOs Boardwalk Empire loaned its Greenpoint, Brooklyn set to the NYPD for an exercise in which the NYPDs Emergency Service Unit rushed to the scene by police helicopter, and fast-roped onto the boardwalk to rescue hostages and took six armed terrorists into custody. (WABC Photo/ NYPD DCPI)

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