U.S. Marine Corps photo by Lance Cpl. John Robbart III/Released 110628-M-3215R-006.jpg
Jun 28, 2011
Marines and sailors with the 15th Marine Expeditionary Unit (MEU) shake their gas masks vigourously as a part of the Mask Confidence Exercise, an annual gas mask training, at the 33 Area Gas Chamber, June 28. The purpose of shaking the gas masks is to simulate intense physical movement and it ensures a tight seal to prevent contaminants in the environment from entering the mask. The 15th MEU is currently in its dwell period and uses this time to complete various annual training.
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