U.S. Air Force Tech. Sgt. Gabriel Lleras from the 452nd Security Forces Squadron, March Air Reserve Base, Calif., searches a host national for unauthorized material at an entry control point, during Operational Readiness Exercise, Crisis Challenge 09-12B, at the Combat Readiness Center in Gulfport, Miss., Sept. 19, 2012. (U.S. Air Force photo by Tech. Sgt. Efren Lopez)

Members participating in the Operational Readiness Exercise, Crisis Challenge 09-12B, at the Combat Readiness Center in Gulfport, Miss., Sept. 17, 2012, use teamwork to assemble a barrier the will be used for shelter during the exercise. (U.S. Air Force photo by Tech. Sgt. Efren Lopez)

During the Operational Readiness Exercise, Crisis Challenge 09-12B, at the Combat Readiness Center in Gulfport, Miss., Sept. 17, 2012, firefighters were tasked with scenarios that tested their skills and reaction time. (U.S. Air Force photo by Tech. Sgt. Efren Lopez)

U.S. Airmen from March Air Reserve base, Calif., prepare to unload a C-17 Globemaster III aircraft, transporting service members and equipment to take part in Operational Readiness Exercise, Crisis Challenge 09-12B, at the Combat Readiness Center in Gulfport, Miss., Sept. 17, 2012. During the exercise, evaluators determine wing members’ ability to mobilize, deploy, survive in combat environments and redeploy to home station. (U.S. Air Force photo by Tech. Sgt. Efren Lopez)

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)