Images: Ardent Sentry [Image 2 of 7]
Photo by Petty Officer 2nd Class Bryan Weyers
Canadian army divers head towards the shore after searching for mines at the bottom of the bay in North Sydney, Nova Scotia, during Exercise Frontier Sentinel 2012. Frontier Sentinel is a combined interagency exercise involving Joint Task Force Atlantic, the U.S. Coast Guard and the U.S. 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.