Settling down
U.S. Air Force Airman 1st Class Justin Polk, 23rd Civil Engineer Squadron augmentee, left, and Airman 1st Class Jirah Petty, 23rd Security Forces Squadron, remove their gas masks after returning to a lower mission-oriented protective posture (MOPP) level during a phase II operational readiness exercise. MOPP levels are used to let Airmen know the amount of personal protective equipment needed to defend against possible chemical attacks. (U.S. Air Force Photo by Staff Sgt. Joshua J. Garcia/Released)
PHOTO BY:
Staff Sgt. Joshua J. GarciaReleased
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