The U.S. Coast Guard Cutter Mackinaw (WLBB-30) delivers Christmas trees from northern Michigan to Chicago every year as a part of Chicago’s Christmas Ship program. The one-of-a-kind icebreaker and its predecessor, USCGC Mackinaw (WAGB-83), have delivered more than 25,000 Christmas trees to Chicago families in the past 20 years. U.S. Coast Guard photo by Cmdr. John M. Stone.