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230201-N-N1574-1002 PORTSMOUTH, Va. (Feb. 1, 2023) Aviation Warfare Systems (AWS) crewman is fitted with blast overpressure monitoring equipment prior to a GAU-21 heavy machine gun exercise aboard an MH-60S helicopter in February 2023. Navy industrial hygienists collect real-time exposure data to support force preservation and mission effectiveness in aviation gunner operations. (U.S. Navy courtesy photo)
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