A member of the Royal Canadian Mounted Police stands watch as migrants are detained aboard the survey research vessel Strait Hunter, simulating a migrant vessel during Exercise Frontier Sentinel 12. 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.