Photo G3583: Sentry Dog “Duke” of the 212th MP Company (Sentry Dog), 720th MP Battalion, 89th MP Group, 18th MP Brigade, Vietnam. Duke was kenneled and worked at the Long Binh Post (Bien Hoa Province) detachment in Military Region III in 1969. If you were Dukes handler, please use this Email Link. Courtesy of SP/4 M. DuBois Miller, 212th MP Company (Sentry Dog), 1969-1970.