U.S. Air Force pararescueman Michael Muller, assigned to the 48th Rescue Squadron, Davis Monthan Air Force Base, copies down patient symptoms during a search and rescue mission at Angel Thunder 2011 on Oct. 11. Approximately 1,400 U.S. military, federal and state employees and Coalition Forces are participating in the 6th Annual Angel Thunder Exercise. Angel Thunder is the world's largest military search and rescue exercise in the world.