Participants in the Angel Thunder exercise practice narrowing in their sights during the exercises Oct. 14, 2011, at Davis-Monthan Air Force Base, Ariz. Approximately 1,400 U.S. military, federal and state employees, and coalition forces participated in the fifth annual Angel Thunder exercise, the largest military combat search and rescue exercise in the world. (U.S. Air Force photo/Airman 1st Class Christine Griffiths)