Navy Hospital Corpsman 1st Class Edgar Guirola, right, a preventive medicine technician with Headquarters and Support Company, Headquarters Battalion, 1st Marine Regiment, 1st Marine Division, and Hospitalman Seaman Christopher Cutshall, left, a preventive medicine representative with Headquarters and Support Company, Combat Logistics Battalion 5, Headquarters Regiment, 1st Marine Logistics Group, use a sound level meter during Preventive Medicine Exercise 2017 at Camp Pendleton, Calif., Nov. 28, 2017. Exercise PREVMEDEX 17 is a five-day field evolution, hosted by the Preventive Medicine

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Navy Hospital Corpsman 1st Class Edgar Guirola, right, a preventive medicine technician with Headquarters and Support Company, Headquarters Battalion, 1st Marine Regiment, 1st Marine Division, and Hospitalman Seaman Christopher Cutshall, left, a preventive medicine representative with Headquarters and Support Company, Combat Logistics Battalion 5, Headquarters Regiment, 1st Marine Logistics Group, use a sound level meter during Preventive Medicine Exercise 2017 at Camp Pendleton, Calif., Nov. 28, 2017. Exercise PREVMEDEX 17 is a five-day field evolution, hosted by the Preventive Medicine Unit allowing regional public health professionals and participants from the Marine Expeditionary Force to conduct hands-on training in order to develop key skills that reduce health risks.( Marine Corps photo by Cpl. Roderick Jacquote)

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