ATLANTIC OCEAN (Oct. 6, 2016) – Petty Officer 1st Class Sean Knight tests a space for toxic gas by taking readings using a "six gas," an instrument that measures levels of different types of toxic gases, during damage control training drills aboard amphibious assault ship USS Iwo Jima (LHD 7). Iwo Jima is currently underway in the Atlantic Ocean awaiting further tasking as Hurricane Matthew develops. ( Navy photo by Seaman Daniel C. Coxwest/Released) 161006-N-AH771-040 161006-N-AH771-040

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