Members of the National Science Foundation wintering in the Antarctic prepare the drop zone for a C-17 Globemaster III that will be airdropping supplies Dec. 20. Airmen from the 62nd and 446th Airlift Wings at McChord Air Force Base, Wash., delivered 70 tons of supplies to the team. The mission was a "proof of concept" flight for the C-17 and was part of Joint Task Force-Support Forces Antarctica's Operation Deep Freeze. (U.S. Air Force photo/Lt. Col. James McGann)