A U.S. Air Force C-17 Globemaster III taxis through the snow on Pegasus Ice Runway, Antarctica during Operation Deep Freeze (ODF), July 15, 2016. ODF is the logistical support provided by the Department of Defense to the U.S. Antarctic Program (USAP). This includes the coordination of strategic inter-theater airlift, tactical intra-theater airlift and airdrop, and transportation requirements supporting the National Science Foundation, the lead agency for the USAP. (U.S. Air Force Reserve photo by Staff Sgt. Madelyn McCullough)