Marines with III Marine Expeditionary Force Information Group test the fit and function of their M50 Joint Service General Purpose Mask before entering the gas chamber for a qualification at Camp Hansen, Okinawa, Japan, Dec. 19, 2018. Marines are required to show their proficiency with a mask by breaking the seal, allowing 2-chlorobenzalmalononitrile gas to fill the mask, then clearing their mask out.

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Size: 1783px × 1122px
Photo credit: © Conner Flecks / Alamy / Afripics
License: Licensed
Model Released: No

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