Photo G3155: Crew members of a 458th (PBR) and B Company, 720th MP Battalion, 89th MP Group, 18th MP Brigade River Patrol Unit fuel their PBR on the bank of the Dong Nai River Vietnam in 1969. If you can identify any of these troops use this Email Link. Courtesy of SP/4 Kenneth J. Marraccini, B Company & HQ Detachment, 720th MP Battalion, 89th MP Group, 18th MP Brigade, Vietnam, October 1968-December 1969.