U.S. Airmen from March Air Reserve Base, Calif., prepare for MOPP 4 conditions during the Operational Readiness Exercise, Crisis Challenge 09-12B, at the Combat Readiness Center in Gulfport, Miss., Sept. 17, 2012. As shown, members are required to don their protective masks in the one-knee down position. (U.S. Air Force photo by Tech. Sgt. Efren Lopez)
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