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Senior Airman Richard Westra, a geophysical maintenance supervisor with the Air Force Technical Applications Center, Patrick AFB, Fla., snaps a photo of the last sunset of the year at McMurdo Station, Antarctica. Westra was one of six Airmen from the nuclear treaty monitoring center who traveled to Earth’s southernmost point to conduct annual maintenance on AFTAC’s seismic equipment. (U.S. Air Force photo by Senior Airman Richard Westra)