Keywords: 120520-G-JL323-048 (7257544116).jpg Chicago Police Department Marine Unit Officer Mark Walsh left discusses tactics techniques and procedures with U S Coast Guard Petty Officer 2nd Class Dale Veverka the coxswain of a USCG Response Boat-Small during a security patrol on the Chicago River during the 2012 NATO summit in Chicago May 20 2012 The Coast Guard worked with partner agencies to protect the city during the summit DoD photo by Petty Officer 2nd Class George Degener U S Coast Guard/Released https //www flickr com/photos/39955793 N07/7257544116/ 120520-G-JL323-048 2012-05-20 08 55 https //www flickr com/people/39955793 N07 U S Department of Defense Current Photos PD-USGov U S Department of Defense Current Photos https //flickr com/photos/39955793 N07/7257544116 2016-09-03 11 13 57 United States Government Work Security North Atlantic Treaty Organization United States Coast Guard |