U.S. Air Force Staff Sgt. Timothy Castillo, left, and Tech. Sgt. Jennifer Dean, 7th Security Forces Squadron K-9 handlers, sort through training equipment June 23, 2015, Abilene, Texas. K-9 handlers assigned to the 7th SFS conducted a training exercise at the Mall of Abilene by planting wires and contraband for the military working dogs to find. (U.S. Air Force photo by Senior Airman Shannon Hall/Released)