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Coast Guard Cutters Shackle and Tackle Break Ice on the Penobscot River

Coast Guard Cutters Tackle and Shackle break ice along the Penobscot River in Bangor, Maine, Feb. 21, 2013. These crews regularly break ice along Maine’s rivers to keep the waterway open for commercial traffic and to prevent flooding. U.S. Coast Guard video by Petty Officer 2nd Class Rob Simpson.