Special Zone Campaign.Tunnel Rats

DATE: 12/03/2026

TIME (GMT): 19:00

ERA: Vietnam

MAP(S): Rung Sat.Special Zone

TYPE: COOP

TEAMSPEAK: ts1.biaarma.com

GAME: Arma 3

EVENT: Official

AUTHOR(S): Aris,Lord and Vuk for Brothers in Arms

SLOTS: 62 / 106

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RATING: not rated yet! (0)

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Rung Sat Special Zone was the name given during the Vietnam War by the South Vietnam Government and American forces to a large area of the Sac Forest , which is today known as the Can Gio Mangrove Forest. It was also known as the Forest of Assassins.The name was derived from a misinterpretation of the Vietnamese word Sat to mean assassin. The actual name, Rung Sat, is a Sino-Vietnamese word that roughly translated to salty forest, a reference to its proximity to the saltwater marshes of the delta.

The Sac Forest comprises approximately 1,256 square kilometres of tidal mangrove swamp including over 4,800 kilometres of interlocking streams located approximately 36 kilometres south-southeast of Saigon. Its boundaries in 1962 were Nha Be District and Nhon Trạch District to the north, Long An Province and Tien Giang Province to the west, Phuoc Tuy Province to the east and the South China Sea to the south.

On 8 June 1962, the South Vietnamese Government organized the Rung Sat Special Zone as a military region in order to defend the Long Tau River, the main shipping channel from Saigon to Vung Tau.

The Cong (VC) established base areas in the zone from the late 1950s and in April 1966 COSVN designated the area as the D-10 Special Military Zone.

Due to the difficult conditions for ground operations within the zone, the VC regarded it as a safe area, however from 1965 onwards the USAF began defoliating the area as part of Operation Ranch Hand.

Following attacks on allied shipping on the Long Tau River, from 27 March to 6 April 1966, 1st Battalion 5th Marines and two Battalions of Vietnamese Marines launched Operation Jackstay, a search and clear operation along the Long Tau shipping channel killing 63 VC and seizing and destroying large supply caches.

Following the conclusion of Operation Jackstay, the Marines handed over responsibility for the zone to the 1st Battalion, 18th Infantry Regiment.Responsibility for security in the zone was then passed to the Mobile Riverine Force and the 9th Infantry Division.

On 20 May 1966 the U.S. Navy established Mine Squadron 11, Detachment Alpha. The unit s twelve 57 foot fiberglass hulled MSBs, along with Republic of Vietnam Navy (RVNN) minesweeping motor launches, continuously swept the river to ensure the safety of the merchant ships. Patrols were conducted early in the morning from Nha Be Base using paravanes and chain drag sweeps to sever electrical wires that connected mines in the river with VC guerrillas ashore ready to trigger them.

Heavy VC activity against U.S. merchant ships and river patrol forces on the Long Tau occurred during the period from December 1965 to February 1967. During that period the enemy made 18 attacks against allied vessels, including the 23 August 1966 attack on the SS Baton Rouge Victory.

In August 1966 attackers sank an RVNN minesweeper, killing or wounding five Vietnamese sailors and wounding two American naval advisers. The VC sank another minesweeper in January 1967. On 15 February 1967 VC ambushers struck MSB 49 with 75mm recoilless rifle and automatic weapons fire that wounded all six crew members and devastated the boat. That same day, the VC sank MSB 45, killing two American sailors and wounding another 16. On 20 April 1967, while en route to Saigon, T LST-550 came under 75mm recoilless rifle fire that killed one Japanese crew member and wounded another five. On 18 November the VC attacked American President Lines SS President Buchanan. A further five merchant ships were attacked during 1967.

In 1968 the VC launched 44 attacks. In April two men on the tug Michael were killed. On 30 August the VC hit the roll-on roll- ff ship Transglobe with a 122mm rocket, mortally wounding one crewmember.

The VC launched 51 assaults in the first half of 1969. In June an operation was launched against the VC sapper battalion operating from the Nhon Trạch District north of the Rung Sac. A force of U.S. and South Vietnamese riverine combatants attack helicopters and U.S., Australian and Thai infantry units swept through Nhon Trạch and part of the Rung Sac. The operation resulted in the destruction of four VC base camps and the death or capture of 53 VC. Afterward, U.S. and South Vietnamese forces kept applying pressure on the VC, frustrating their efforts to regroup. Army bulldozers and aerial sprayed herbicides denuded much of the Rung Sac s foliage. The VC did not launch a single attack on the merchant ships transiting the Long Tau well into 1970. On 1 November 1970 the VC carried out an attack on the American President Lines SS President Coolidge, but the next attack did not occur until a year later when they struck SeaLand s Raphael Semmes.

The Rung Sat formed the western boundary of the 1st Australian Task Force (1 ATF) tactical area of responsibility.From July to November 1970 1 ATF forces mounted 17 boat patrols in the Rung Sat with limited results, before switching to helicopter patrols that would land troops to investigate any VC sightings,

 

 

American forces crossed the imaginary front line to usually search for underground Viet Cong bases from where they launched their attacks and ultimately destroy them.