Keywords: 120501-N-HN353-090 (7136046537).jpg Royal Canadian Navy divers assigned to Fleet Diving Unit Atlantic practice disabling a mine May 1 2012 in Sydney Nova Scotia during Frontier Sentinel 2012 Frontier Sentinel is a combined interagency exercise involving Joint Task Force Atlantic the U S Coast Guard and Navy Fleet Forces Command The exercise is designed to develop and validate existing plans treaties and standard operation procedures for a bilateral response to maritime homeland defense and security threats U S Navy photo by Mass Communication Specialist 2nd Class Ernesto Hernandez Fonte/Released https //www flickr com/photos/39955793 N07/7136046537/ 120501-N-HN353-090 2012-05-01 09 01 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 N07/7136046537 2016-09-03 11 42 21 United States Government Work Frontier Sentinel Royal Canadian Navy |