Air Force Master Sgt. Aisha Davis, Air Force School of Aerospace Medicine public health instructor, calls on a student in the hearing lab at Wright-Patterson Air Force Base, Ohio, Nov. 15, 2017. Davis was teaching a hearing conservation lecture on how to perform daily preliminaries, involving a functional check to make sure equipment is working properly before conducting hearing tests on patients. ( Air Force photo by Michelle Gigante)

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Keywords: america, armed, ear, forces, headphones, health, hearing, lab, military, protection, public, service, states, tests, united, usa, usafsam