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In this Aug. 21, 2021, image provided by the U.S. Air Force, U.S. Airmen and U.S. Marines guide evacuees aboard a U.S. Air Force C-17 Globemaster III in support of the Afghanistan evacuation at Hamid Karzai International Airport in Kabul, Afghanistan. (Senior Airman Brennen Lege/U.S. Air Force via AP)