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Lt. Col. John Merkley, Army Public Health Center, tests out a boothless audiometry headset system, one of four systems demonstrated by manufacturers during a workshop hosted by the DoD Hearing Center of Excellence at this year's National Hearing Conservation Association Conference. (HCE photo)

Lt. Col. John Merkley, Army Public Health Center, tests out a boothless audiometry headset system, one of four systems demonstrated by manufacturers during a workshop hosted by the DoD Hearing Center of Excellence at this year's National Hearing Conservation Association Conference. (HCE photo)

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