Instructor Sgt. 1st Class Donnale S. Williams, a noncommissioned officer with the 38th 1st Detachment in Ohio, demonstrates the correct way to perform preventive maintenance checks on a gas mask filter at Camp Atterbury, Indiana, Thursday, July 19, 2018. Maintenance checks is just one step used to make sure that all equipment is ready in the event of an emergency.

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Photo credit: © Barney Low / Alamy / Afripics
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