Harry, a six year old German shepherd military working

Harry, a six year old German shepherd military working dog, bites the arm of Lance Cpl. Zack Barkley, a dog handler with the 26th Marine Expeditionary Unit (MEU), during canine training aboard the amphibious assault ship USS Iwo Jima (LHD 7) in the Atlantic Ocean as part of Combined Composite Training Unit Exercise (COMPTUEX) with the MEU, Nov. 21, 2017. The working dogs are trained in tracking scents and explosives, as well as attacking any threats that Marines may encounter while deployed. (U.S. Marine Corps photo by Cpl. Jon Sosner)