Soldiers with the 270th Military Police Company, 185th Military Police Battalion, 49th Military Police Brigade, California Army National Guard, air themselves out following an exercise where they proved they understood how to use a gas mask properly, then take it off to understand the importance of the mask. It is required training for soldiers to have, so in the event of a chemical attack, they will be prepared and knowledgeable on how to use gas masks and the correct protocol, Camp San Luis Obispo, July 17.