U.S. Air Force Senior Airman Terry Pasko, 379th Expeditionary Security Forces Squadron dog handler, guides military working dog Guero, over an obstacle course, Oct. 1, 2012 in Southwest Asia. Military working dogs are used throughout the Air Force and the U.S. military for detecting drugs and explosives, deterring threats, and protecting their handlers. Both are deployed from the 11th Security Support Flight, Joint Base Andrews, Md. (U.S. Air Force photo/Staff Sgt. Sheila deVera)