Navy Chief Petty Officer Ranilo Untivero, right, instructs sailors how to prepare their self-contained breathing apparatus during shipboard firefighting training aboard the amphibious dock landing ship USS Ashland in Yokosuka, Japan, Oct. 16, 2017. Untivero is an aviation boatswain’s mate (fuels) and lead instructor assigned to the General Shipboard Firefighting Course in Yokosuka. Navy photo by Petty Officer 3rd Class Jonathan Clay