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THE NAVY SETS AN EXAMPLE IN READINESS FOR GAS ATTACKS. FEBRUARY 1941, ON BOARD THE DESTROYER HMS KELVIN, IN PLYMOUTH SOUND. DURING A GAS DRILL WHICH LASTED THREE QUARTERS OF AN HOUR. ALL DUTIES WERE CARRIED OUT WITH GAS MASKS. (A 3187) Sailors on the mess deck wearing gas masks while reading and writing letters when off duty. Copyright: © IWM. Original Source: http://www.iwm.org.uk/collections/item/object/205137601