U.S. Marine Corps photo by Cpl. Michael A. Bianco/Released 100419-M-4689B-016.jpg
Apr 19, 2010
A Marine with the 31st Marine Expeditionary Unit (MEU), breaks the seal of his M-40 field protective mask during a Mask Confidence Exercise, April 19. The exercise was a part of MOPP familiarization training (MOPP FT). MOPP FT satisfies a Marine’s individual training requirement for chemical, biological, radioactive and nuclear (CBRN) defense training. (Official Marine Corps photo by Cpl. Michael A. Bianco)
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