Exhaust vapors form around a C-17 Globemaster III after engine start-up during an Operation Deep Freeze winter fly-in mission Aug. 25 at Pegasus White Ice Runway, Antarctica. A C-17 and 31 Air Force Reserve and Regular Air Force Airmen from McChord Air Force Base, Wash., conducted the annual winter fly-in augmentation of scientists, support staff, food and equipment for the U.S. Antarctic Program at McMurdo Station, Antarctica. (U.S. Air Force photo/Tech. Sgt. Shane A. Cuomo)