Photo G1995: SP/4 Donnie Ross working the A Company, 720th MP Battalion, checkpoint on Highway 316, III Corps Tactical Zone, at the Rock Quarry in Vietnam, 1967. The water truck in the background is used to spray the roadway to cut down on the dust. Courtesy of SP/4 Donnie A. Ross, A Company, 720th MP Battalion, 89th MP Group, 18th MP Brigade, September 1967 to September 1968.