Katya, a military working dog, chases a ball after finding explosives stashed in the wheel of a vehicle with her handler, U.S. Air Force Staff Sgt. Justin Aycock from Charlotte, N.C., assigned to the 52nd Security Forces Squadron, during a training mission on Contingency Operating Base Adder, Dhi Qar, Iraq, Sept. 24, 2009. Aycock provided demonstrations to the Iraqi police on explosives searching techniques with K-9s.