M-50 Gas Mask
Master Sgt. Leslie Koger of the 245th Air Traffic Control Squadron, McEntire Joint National Guard Base, S.C., patiently completes her new M-50 gas mask "fit test", Oct. 18, 2012. (National Guard photo by Master Sgt. Marvin R. Preston/Released)

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Photo by: Master Sgt. Marvin R. PrestonRELEASED |  VIRIN: 121018-Z-RK459-006.JPG