The Coast Guard Cutter Mackinaw was breaking ice up to two feet thick during the last scheduled ice-breaking operations of the winter season. in Whitefish Bay, March 30, 2013. The Coast Guard Cutter Mackinaw, a 240-foot icebreaker homeported in Cheboygan, Mich., breaks ice at dusk in Whitefish Bay, March 27, 2013. U.S. Coast Guard photo by Petty Officer 1st Class Erin Hunter. The Coast Guard Cutter...