The Coast Guard Cutter Mackinaw, a 240-foot icebreaker homeported in Cheboygan, Mich., works joint operations with the Canadian Coast Guard Ship Samuel Risley to free the motor vessel Manitowoc from an ice plug in the vicinity of Whitefish Bay, March 26, 2013. The Mackinaw, CCGS Samuel Risley along with the Coast Guard Cutter Alder, a 225-foot buoy tender with ice-breaking capabilities homeported in Duluth, Minn., worked together to get the Manitowoc moving again.