Petty Officer 1st Class Matthew Nalley, master at arms, a native of Whitesburg, Ga., plays the part of an aggressor as military working dog, Axe, bites onto a training sleeve during a demonstration at Forward Operating Base Diamondback, in Mosul, Iraq, Aug. 17, 2009. Nalley is a kennel master assigned to the 25th Infantry Division's Canine Section.