Master Sgt. Justin Halterman, 570th Contingency Response Group aerial transportation craftsman from Travis Air Force Base, Calif., guards his group command post during a firefight at Geronimo Landing Zone on Fort Polk, La., Oct 15, 2012. The CRG was supporting Joint Readiness Training Center Exercise - Decisive Action. The exercise includes emphasis on joint forcible entry, phased deployment with an airborne parachute operation, a combined noncombatant evacuation, combine arms maneuver, wide area security, unconventional warfare and unified land operations in a joint, interagency, intergovernmental and multinational environment. (U.S. Air Force photo/Tech. Sgt. Parker Gyokeres)