Air Force Staff Sgt. Gerard Gutierrez, 821st Contingency Response Squadron air transportation specialist, signals to a K-loader May 25, 2021, during exercise Mobility Guardian 2021 at Oscoda-Wurtsmith Airport, in Oscoda, Michigan. Mobility Guardian is a training exercise to prepare Airmen to face real-world security challenges and sustain strategic deterrence anywhere and at any time.

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Keywords: 621st, amc, crw, mg21