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211012-N-PH222-2035 SULU SEA (Oct. 12, 2021) Sailors attend a chemical, biological, and radiological training class in the mess decks aboard Independence-variant littoral combat ship USS Charleston (LCS 18), during routine operations. Charleston, part of Destroyer Squadron Seven, is on a rotational deployment, is on a rotational deployment in the U.S. 7th Fleet area of operation to enhance interoperability with partners and serve as a ready-response force in support of a free and open Indo-Pacific region. (U.S. Navy photo by Mass Communication Specialist 2nd Class Ryan M. Breeden/released)