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Senior Airman Blaine McElhaney, KC-135 Stratotanker crew chief, changes the oil in a KC-135 engine during Exercise Grand Shield 23-1 at Al Udeid Air Base, Qatar, Mar. 15, 2023. Grand Shield is a recurring exercise that allows the 379th Air Expeditionary Wing to test its response capabilities to simulated threats. (U.S. Air Force photo by Staff Sgt. Derek Seifert)
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