The crew aboard Coast Guard Cutter Mackinaw, a 240-foot icebreaker homeported in Cheboygan, Mich., works side-by-side with the crew of Canadian Coast Guard Ship Samuel Risley, Dec. 23, 2013, in the St. Marys River to ensure commercial vessel traffic continues to move. The ice-breaking partners have been sailing together for the past week to maintain tracks through the ice for the numerous vessels still transiting the river. U.S. Coast Guard photo by Ensign Michael Cooper