Nov 17, 2016

U.S. Navy Commander Alan Ross leads a class about the levels of harmful sound to ears by using a M3 Sound Detector during Preventative Medicine Exercise 2016 at Camp Pendleton, Calif., Nov. 10, 2016. Being able to detect sound helps technicians distinguish when a situation may require hearing protection due to excessive and potentially harmful noise. Ross is an audiologist with the Navy Environmental Preventative Medicine Unit No. 5. (U.S. Marine Corps photo by Lance Cpl. Joseph Sorci)

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1st Marine Logistics Group