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A Mark 38 Mod 4 30mm machine gun fires during a live-fire exercise aboard Arleigh Burke-class guided-missile destroyer USS Mustin (DDG 89) in the South China Sea, April 17, 2026. Mustin is forward-deployed and assigned to Destroyer Squadron (DESRON) 15, the Navy’s largest DESRON and U.S. 7th Fleet’s principal surface force. U.S. 7th Fleet, the Navy’s largest forward-deployed numbered fleet, routinely interacts and operates with allies and partners in preserving a free and open Indo-Pacific. (U.S. Navy photo by Mass Communication Specialist 2nd Class Timothy Dimal)
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