Air Force Staff Sgt. Sondra Pennington, 628th Medical Group mental health technician, inspects her gas mask as part of Crescent Reach 16, May 19, 2016, at Joint Base Charleston, Crescent Reach is an annual exercise designed to test and evaluate Joint Base Charleston's ability to mobilize and launch a large aircraft formation in addition to train, process and deploy airmen and cargo in response to a simulated crisis board. ( Air Force photo by Senior Airman Ericka Engblom)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
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