Marine Lance Cpl. Michael Oustayan breaks capsules over a hotplate which melts and releases 2-chlorobenzalmalononitrile gas during for a gas chamber qualification at Camp Hansen, Okinawa, Japan, Dec. 19, 2018. Marines are required to show their proficiency with a M50 Joint Service General Purpose Mask by breaking the seal, allowing CS gas to fill the mask, then clearing their mask out. Oustayan is a chemical, biological, radiological, nuclear defense specialist with 7th Communication Battalion, III Marine Expeditionary Force Information Group.

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Photo credit: © Conner Flecks / Alamy / Afripics
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