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Airmen from the Air Force Technical Applications Center, Patrick AFB, Fla., walk on a frozen lake in Antarctica after a full day of performing maintenance on the center’s seismic equipment near Bull Pass. The photo, taken at about 10 p.m., illustrates the 24-hour daylight cycle at Earth’s southernmost point. Pictured from left to right: Staff. Sgt. Jeremy Hannah, Senior Airman Andrew Pouncy and Staff Sgt. Justin Sherman. (U.S. Air Force photo by Senior Airman Richard Westra)