) Canadian Army combat divers from 4 Engineering Support Regiment search for simulated mines in Sydney Harbor during mine countermeasures as part of Exercise Frontier Sentinel 2012. Frontier Sentinel is a combined interagency exercise involving Joint Task Force Atlantic, the Coast Guard and the Navy Fleet Forces. The exercise is designed to continue to develop and validate the existing plans, treaties and standard operating procedures for a bilateral response to maritime homeland defense and security threats.


) Canadian Army combat divers from 4 Engineering Support Regiment search for simulated mines in Sydney Harbor during mine countermeasures as part of Exercise Frontier Sentinel 2012. Frontier Sentinel is a combined interagency exercise involving Joint Task Force Atlantic, the Coast Guard and the Navy Fleet Forces. The exercise is designed to continue to develop and validate the existing plans, treaties and standard operating procedures for a bilateral response to maritime homeland defense and security threats.


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