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Emerald Warrior 2017
A U.S. Air Force pilot with the 121st Air Refueling Wing, Ohio Air National Guard performs pre-flight checks of a KC-135R Stratotanker during a training sortie in support of Emerald Warrior 17 March 7, 2017. Emerald Warrior is a U.S. Special Operations Command exercise during which joint special operations forces train to respond to various threats across the spectrum of conflict. (U.S. Air National Guard photo by Senior Airman Ashley Williams)