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Gunners of 26 Squadron (Sqn) Royal Air Force (RAF) Regiment based at RAF Honington wearing the GSR10 gas mask during an exercise, February 9, 2011 (Credit: UK Ministry of Defence/Cpl Dylan Bob Browne via Flickr)

Gunners of 26 Squadron (Sqn) Royal Air Force (RAF) Regiment based at RAF Honington wearing the GSR10 gas mask during an exercise, February 9, 2011 (Credit: UK Ministry of Defence/Cpl Dylan Bob Browne via Flickr)