U.S. Air Force Staff Sgt. Justin Larson a HH-60 Pave Hawk flight engineer, 55th Rescue Squadron punches in numbers during pre-flight operations prior to takeoff during Angel Thunder 2011, Oct. 11, 2011. 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.