U.S. Coast Guard Petty Officer 1st Class John Mathis prepares a sled for use during ice rescue training Jan. 19, 2020, about seven miles north of McMurdo Station, Antarctica. The crew of the Coast Guard Cutter Polar Star (WAGB-10) is participating in Operation Deep Freeze – the U.S. military’s contribution to the U.S. Antarctic Program, which is managed by the National Science Foundation. U.S. Coast Guard photograph by Senior Chief Petty Officer NyxoLyno Cangemi