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![Senior Airman Alphonso Carter, 374th Public Health technician, prepares to perform a hearing test, Aug. 7, 2017, at Yokota Air Base, Japan. The Airman being tested is equipped with headphones and a Senior Airman Alphonso Carter, 374th Public Health technician, prepares to perform a hearing test, Aug. 7, 2017, at Yokota Air Base, Japan. The Airman being tested is equipped with headphones and a](https://c8.alamy.com/comp/MN2HRW/senior-airman-alphonso-carter-374th-public-health-technician-prepares-to-perform-a-hearing-test-aug-7-2017-at-yokota-air-base-japan-the-airman-being-tested-is-equipped-with-headphones-and-a-button-to-click-each-time-they-hear-a-beep-while-they-are-in-a-special-sound-proof-chamber-us-air-force-photo-by-airman-1st-class-donald-hudson-MN2HRW.jpg)