Riv Div 552

River Division 552 (RivDiv 552) was a unit of the United States Navy’s Mobile Riverine Force, active during the Vietnam War. Established in the late 1960s, the division operated Patrol Boat, River (PBR) craft, conducting patrols, interdiction, and combat operations along the Mekong Delta’s complex waterways. RivDiv 552 played a key role in disrupting Viet Cong supply lines, providing fire support for ground troops, and supporting riverine assaults. The unit’s actions contributed to the broader mission of controlling the vital inland rivers and denying enemy forces access to these critical routes.