Senior Airman Krystal Collier secures a landing zone for a Marine CH-46 Sea Knight as the helicopter lands in the background during a joint, mass-casualty exercise Aug. 4, 2013, at Grissom Air Reserve Base, Ind. Collier and other Airmen assigned to the 434th Security Forces Squadron embedded with Marines and Air Force explosive ordinance disposal units during an initial assault to secure a voting location in a simulated overseas nation. (U.S. Air Force photo by Tech. Sgt. Mark R. W. Orders-Woempner) via Wikimedia Commons.