A small synthetic aperture mine (SSAM) hunter is lowered into the Portsmouth Harbor to detect fake mines during Frontier Sentinel, a multi-agency training exercise.

PORTSMOUTH, N.H. (Jun. 11, 2008) A small synthetic aperture mine (SSAM) hunter is lowered into the Portsmouth Harbor to detect fake mines during Frontier Sentinel, a multi-agency training exercise. The annual maritime homeland security exercise involves the Canadian and U.S. Naives and the United States Coast Guard, as well as numerous other federal, state and local agencies in the detection, assessment and response to a maritime security threat. U.S. Coast Guard photo by Petty Officer Seth Johnson File# 080611-G-6464J-333