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Marc Knapper, U.S. Embassy Seoul deputy chief of mission, and Col. Andrew Hansen, 51st Fighter Wing commander, step on board the NASA DC-8 that is part of the Korea United States-Air Quality (KORUS-AQ) Experiment at Osan Air Base, Republic of Korea, April 29, 2016. KORUS-AQ is a step toward an international effort to develop a global air quality observation system that will include satellites from both countries and a network of surface monitoring sites, models, and airborne sampling.(U.S. Air Force photo by Staff Sgt. Jonathan Steffen/Released)
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