More than 300 volunteers from various youth organizations, including the Sea Scouts, Sea Cadets, and Young Marines, help crew members of the Coast Guard Cutter Mackinaw unload more than 1,200 Christmas trees in Chicago, Dec. 7, 2013. The Mackinaw is serving as the Christmas Ship once again, helping to re-enact a Chicago maritime tradition dating back to the late 1800s and early 1900s. (U.S. Coast Guard photo by Chief Petty Officer Alan Haraf)