The U.S. Coast Guard Cutter Polar Star makes is moored at the National Science Foundation's McMurdo Station, deploying for Operation Deep Freeze 2017, Jan. 18, 2017.The primary mission of the Polar Star is to establish a navigable channel through Antarctic ice to allow for cargo and fuel ships to safely resupply two of NSF's three Antarctic research stations. (U.S. Coast Guard photos by Chief Petty Officer David Mosley)