150617-N-NT265-182 YOKOSUKA, Japan (June 17, 2015) Master-at-Arms 3rd Class Kelsey Carlton, from Clearwater, Fla., assigned to the military working dog unit at Fleet Activities Yokosuka, conducts obstacle course training with military working dog Donci. The canines with the unit are used to apprehend suspects, detect explosives and narcotics while searching buildings, ships and submarines. (U.S. Navy photo by Mass Communication Specialist 2nd Class Christian Senyk/Released)