Photo G3512  Unidentified handler and his K9 “Duke” in the training yard of the Soc Trang Detachment, 212th MP Company (Sentry Dog), 720th MP Battalion, 89th MP Group, 18th MP Brigade, Mekong Delta, Ba Xuyen Province, IV Corps Tactical Zone, Vietnam in September 1969. If you can identify this handler, use this Email Link. Courtesy of the family of SP/4 Eric G. Osen, 212th MP Company (Sentry Dog), 720th MP Battalion, 89th MP Group, 18th MP Brigade, Long Binh Post & Soc Trang, Vietnam, 1969-1970.