Keywords: 120502-N-HN353-065 (7139760359).jpg U S Sailors with Mobile Diving Salvage Unit 2 deploy an unmanned underwater vehicle May 2 2012 in Sydney Nova Scotia during Frontier Sentinel 2012 Frontier Sentinel is a combined U S Navy U S Coast Guard and Canadian Forces exercise focusing on mine countermeasures and migrant vessel scenarios off the east coast of the United States and Canada The exercise is one of the field components of Ardent Sentry a U S Northern Command exercise focusing on simulated weather security and disaster contingencies DoD photo by Mass Communication Specialist 2nd Class Ernesto Hernandez Fonte U S Navy/Released https //www flickr com/photos/39955793 N07/7139760359/ 120502-N-HN353-065 2012-05-02 09 19 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 N07/7139760359 2016-09-03 11 41 52 United States Government Work Sydney Nova Scotia Frontier Sentinel |