On the prowl
AVIANO AIR BASE, Italy -- Staff Sgt. Charleston Calhoun, 31st Security Forces Squadron military working dog handler, directs MWD Arco where to search for explosives May 13. The U.S. military has used working dogs since the Revolutionary War, initially as pack animals, and later, for more advanced uses. (U.S. Air Force photo/Airman 1st Class Ashley Wood)