A U.S. Air Force C-17 Globemaster III crew chief prepares to marshal a C-17, May 24, 2021, at Alpena Combat Readiness Training Center, Michigan, in support of Mobility Guardian 2021. Conducted biennially, Mobility Guardian is the Air Force’s only formal, Total Force, service-level mechanism for assessing and validating capabilities in Rapid Global Mobility missions specified and implied within the 2018 National Defense Strategy. (U.S. Air Force photo by Senior Airman Charles T. Fultz)
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