Seaman Nicholas Squires and Seaman Heather Brown, members of deck force aboard Coast Guard Cutter Polar Star, take the slack out a line while the ship moors at the ice pier at the National Science Foundation's McMurdo Station in Antarctica, Jan. 23, 2015. Polar Star’s crew is underway supporting Operation Deep Freeze 2015, part of the U.S. Antarctic program, managed by NSF. (U.S. Coast Guard photo by Petty Officer 1st Class George Degener)