U.S. Coast Guard Cutter Spar (WLB 206), home ported in Duluth, Minnesota, begins Operation Taconite on Lake Superior near Duluth, Minnesota, Dec. 10, 2025. The Great Lakes generates roughly 30% of the United States' combined gross domestic product, transporting more than 200 million net tons of cargo annually. (U.S. Coast Guard photo by Cmdr. Donald Rudnickas)