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A U.S. Air Force M50 gas mask hangs after being used - PICRYL - Public Domain Media Search Engine Public Domain Search
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![U.S. Air Force Senior Airman Rebecca Roberts wears her protective M50 gas mask after a simulated decontamination, Jan. 9, 2016, on Atlantic City Air National Guard Base, N.J. The simulated decontamination was U.S. Air Force Senior Airman Rebecca Roberts wears her protective M50 gas mask after a simulated decontamination, Jan. 9, 2016, on Atlantic City Air National Guard Base, N.J. The simulated decontamination was](https://c8.alamy.com/comp/PENR78/us-air-force-senior-airman-rebecca-roberts-wears-her-protective-m50-gas-mask-after-a-simulated-decontamination-jan-9-2016-on-atlantic-city-air-national-guard-base-nj-the-simulated-decontamination-was-part-of-the-177th-fighter-wings-participation-in-contamination-control-area-training-us-air-national-guard-photo-by-senior-airman-shane-karpreleased-PENR78.jpg)