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River Division 92 (RivDiv 92) was one of the two divisions—alongside RivDiv 91—that made up U.S. Navy River Assault Squadron 9 (RAS 9), a major component of the Mobile Riverine Force (MRF) operating in the Mekong Delta during the Vietnam War. It arrived in Vietnam on 28 February 1967 and participated in some of the most intense riverine combat of the war.

What River Division 92 Was

RivDiv 92 was a U.S. Navy “brown‑water” combat unit equipped with Assault Support Patrol Boats (ASPBs), Armored Troop Carriers (ATCs), Monitors, and Command/Control Boats (CCBs). It operated as part of Task Force 117, the Mobile Riverine Force—a joint U.S. Army/Navy formation designed to fight Viet Cong forces in the canals, rivers, and swamps of the Mekong Delta.

📅 Key Timeline for River Division 92

1966–1967: Formation & Deployment

• 1 Nov 1966: RAS 9 (including RivDiv 92) commissioned at Coronado, CA.

• 28 Feb 1967: RivDiv 92 arrives in Vietnam, bringing the squadron to full operational strength.

• Early operations used borrowed Vietnamese Navy boats until U.S. assault craft arrived.

1967: Major Combat Operations

RivDiv 92 participated in nearly all major Mobile Riverine Force operations, including:

• Operation River Raider I (Feb 1967) — first Army/Navy river assault since the Civil War.

• Operation Coronado series (V, VII, IX) — large-scale assaults in Dinh Tuong, Long An, and Rung Sat zones.

• 19 June 1967: Heavy contact in Long An Province; 15 U.S. Navy WIA, including the squadron commander and RivDiv 92 commander.

• 22 July 1967: First use of modified ATCs as medical evacuation platforms (ATC‑92‑4).

1968: Tet Offensive & High Casualties

• 27 Jan 1968: RivDiv 92 engaged during Tet operations around Ben Tre.

• March 1968:

  • ASPB‑92‑7 became the first assault craft sunk by hostile fire.

  • LT David H. Wyrick, commander of RivDiv 92, was killed in action on the Rach Ba Rai during Operation Coronado XII.

• 4 April 1968: One of the deadliest days for RAS 9—3 KIA, 35 WIA. EN2 Joseph Ennis earned the Navy Cross for heroism.

1969: ACTOV Transition

By 1969, RivDiv 92 began training Vietnamese Navy crews under the Accelerated Turnover Program (ACTOV) as U.S. forces prepared to hand over riverine operations.

• May 1969: RivDiv 92 operated with combined U.S./VNN crews supporting the 3/60th Infantry Battalion.

🎖️ What RivDiv 92 Did in Combat

RivDiv 92’s missions included:

• Riverine assaults with U.S. Army 9th Infantry Division

• Search-and-destroy operations in VC base areas

• Troop transport and fire support

• Blocking and interdiction operations

• Medical evacuation and casualty extraction

• Night patrols and ambush countermeasures

Its boats often took heavy machine‑gun, recoilless rifle, RPG, and mine fire in narrow waterways where maneuvering was limited.