Navy Lt. Christian Johnroe, an environmental health officer with 1st Civil Affairs Group, Marine Forces Reserve, explains how to utilize deployment particulate samplers to Sailors from Marine Expeditionary Units and other public health professions during Preventive Medicine Exercise 2017 at Camp Pendleton, Calif., Nov. 30, 2017. Exercise PREVMEDEX 17 is aimed at enhancing the ability of the Marine Expeditionary Force’s preventive medicine personnel and regional public health professionals to support units operating in austere environments. ( Marine Corps photo by Cpl. Roderick Jacquot

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Navy Lt. Christian Johnroe, an environmental health officer with 1st Civil Affairs Group, Marine Forces Reserve, explains how to utilize deployment particulate samplers to Sailors from Marine Expeditionary Units and other public health professions during Preventive Medicine Exercise 2017 at Camp Pendleton, Calif., Nov. 30, 2017. Exercise PREVMEDEX 17 is aimed at enhancing the ability of the Marine Expeditionary Force’s preventive medicine personnel and regional public health professionals to support units operating in austere environments. ( Marine Corps photo by Cpl. Roderick Jacquote)

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