Sgt. Carlos Iruegas, U.S. Marine Corps Forces, Pacific chemical, biological, radiological and nuclear defense chief, pauses in the gas chamber before preparing CS gas (tear gas) aboard Marine Corps Base Hawaii March 19, 2015. Gas chamber training is part of an annual training requirement for Marines. (U.S. Marine Corps photo by Sgt. Sarah Dietz)
Sgt. Sarah Dietz
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