The only surviving heavy icebreaker in the U.S. Coast Guard fleet, the 44-year-old Polar Star (WAGB 10), has a new winter mission after the COVID-19 pandemic caused the cutter’s annual resupply excursion to McMurdo Station in Antarctica to be canceled. Instead, Polar Star sailed to the Arctic in early December from Seattle, where it is home-ported, marking the icebreaker’s first…