The New York City Police Department Emergency Service Unit is the largest ESU with over 500 personnel.
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Among the critics is journalist and political analyst at the Cato Institute, Radley Balko, who has written several books and articles on the subject.
Following the 2008 Mumbai attacks, officers from the OCCB were trained in the use of Ruger Mini-14s to provide support to the Emergency Service Unit in case of a similar situation arising in New York City.
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