U.S. Air Force Pararescuemen, assigned to the 48th Rescue Squadron Davis Monthan AFB., carry litter patients during a earthquake scenario search and rescue mission at Angel Thunder 2011 at Davis-Monthan Air Force Base, Ariz., Oct. 11, 2011. Approximately 1,400 U.S. military, federal and state employees and coalition forces are participating in Exercise Angel Thunder, the largest military search and rescue exercise in the world. DoD photo by Staff Sgt. Andy M. Kin, U.S. Air Force.