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This article "THE UNEXPLOITED VULNERABILITY OF THE MARINES AT KHE SANH" suggests that the PAVN could have captured Khe Sanh by contaminating the local water supply.
Is the author correct in asserting the Khe Sanh could not be supplied from the air with sufficient water if the local water supply was compromised, in addition to the supplies of munitions, rations, fuel, and other essentials? If so, would the Marines really attempt a break-out? Would it not be better to cut down on the supply of munitions and fuel in order to make room for water, and keep defending the base until it can be relieved by ground forces? If American ground forces are diverted to relieve the base, how does this affect the Tet Offensive?
The job of supplying the Marine base at Khe Sanh fell to various Marine Corps and US Air Force aviation units. This airlift would have been a massive operation even under ideal circumstances. The purely logistical problems were compounded by poor visibility that fell below minimum requirements for airfield operations 40 percent of the time. The PAVN added to the difficulty by directing a heavy volume of antiaircraft and artillery fire at incoming aircraft.
The resupply process suffered a sharp setback on February 10 when PAVN gunners shot up a Marine C-130, fully laden with fuel bladders, while it was attempting a landing at the Khe Sanh airstrip. As a result of this incident and fire damage sustained by other aircraft already on the ground, C-130 landings were temporarily suspended during February. At the beginning of March this suspension was made permanent. Consequently, during these periods, the Marines were denied the use of the best heavy-lift aviation assets in their inventory. Most supplies thereafter were delivered by parachute. According to the official Marine Corps history of the battle of Khe Sanh, these parachute drops ". . . were sufficient for bulk commodities such as rations and ammunition." Certain supplies, such as replacement troops, medical evacuations and medical supplies, could only be delivered by aircraft that made actual landings on the runway at Khe Sanh.
In the opinion of this writer, who was present during the siege, this official assessment of the success of US supply capabilities regarding rations was overly optimistic. A hot meal was defined as heated C-rations; the Marines at Khe Sanh sometimes went weeks without hot meals. Rations were routinely limited to two meals per man per day. One Marine reported that he went several days with only one C-ration meal per day. A company commander on Hill 861, located about two miles northwest of the combat base, reported his men were forced to go for days without water. Another reported that his water ration was one-half canteen cup of water per day, which had to suffice for drinking, shaving, and brushing teeth.
Water is an extremely difficult commodity to deliver to a besieged garrison. It is heavy, it must be handled in special containers that cannot be used for the delivery of other liquids, and water containers are vulnerable to incoming artillery attacks. One helicopter crew attempting to deliver water to Hill 861 was rattled by PAVN fire, panicked, and released its cargo from a height of two hundred feet. The parched Marines watched the water containers burst apart in mid-air.
Had the Communists realized the vulnerability of the Marine water supply, they could have forced the abandonment of the combat base. The Marines occupied various hilltop positions surrounding Khe Sanh. These positions, initially supplied from the combat base itself, were later provisioned by helicopters flying from the 3d Marine Division Forward base at Dong Ha. Water for the combat base came from the small Rao Quan River which flowed through hills to the north occupied by the PAVN.
Even though the combat base was not dependent on air-lifted water as the hill positions were, it was, nevertheless, often a scarce commodity. The water point itself was located about 150 meters outside the northern sector of the base perimeter. There was a small hill and tall grass that obscured visual contact with the water point. The water was lifted ninety feet over an 800-foot span by pumps. A dirt dam twenty-five meters wide caused the formation of a reservoir six feet deep. During the extensive rains of September and October, 1967, the dam broke. US Navy EO1 (Equipment Operator First Class) Rulon V. Rees led a detail to repair the dam in the fall of 1967 using old scrapped Marston matting from the airstrip. This detail blasted a crater in the river bed about thirty feet in front of the dam to act as a reservoir in case the river level fell. Marston matting was placed on the face of the dam.
No patrols went out to get the water. It was pumped inside the perimeter and went to a large black rubber water tower container. This reservoir was frequently punctured during the siege, causing temporary lack of water on the base.
Had the PAVN realized how vulnerable the Marines' water supply was, they could have interdicted it by diverting the Rao Quan River or contaminating it, thereby forcing the Marines to attempt a breakout. However, General Giap, who achieved victory at Dien Bien Phu in part due to his meticulous battlefield planning, seems to have not realized the vulnerability of the Marines' water supply. Nor did the local PAVN commander. General Westmoreland did not become aware of the magnitude of the potential water problem until the base was surrounded by the North Vietnamese. By that time, a successful evacuation was not possible.
The concept of an overland evacuation of a reinforced regiment, fighting its way through two or three PAVN divisions that held every tactical advantage, presented a problem of such magnitude that Westmoreland was reluctant to consider it. The Joint Chiefs refused to consider it.
Had the PAVN succeeded in interdicting the combat base's water supply, 3rd Marine Division commander General R. M. Tompkins is quoted in one source as saying that it would have been impossible to provision Khe Sanh with water in addition to its other resupply requirements. However, in a letter to General Davidson, General Tompkins stated that water could have been added to the provisions already being supplied to support the base. By examining the supply requirements and the logistical capabilities of the Americans it is possible to determine which of these contradictory statements is correct.
III Marine Amphibious Force (III MAF) headquarters established the official supply requirement for Khe Sanh at 235 tons per day. The Americans were hard pressed to meet these requirements. The airstrip was completely closed on various occasions due to the weather or damage sustained from enemy fire. During the month of February alone, the combat base had a deficit of 1,037 tons of supplies actually delivered compared to scheduled deliveries. The air delivery problems were compounded when the use of the large C-130 cargo planes was curtailed due to hostile fire. Passenger requirements were met by the use of C-123 aircraft. The smaller capacity of the C-123's necessitated a five-fold increase in landings. More landings meant more targets; one aircraft upon returning to Da Nang was found to contain 242 holes before the maintenance personnel gave up counting. In the first month of the siege four major aircraft were lost to hostile fire.
Helicopters were widely used as resupply vehicles. Only helicopters could reach the hilltop positions, whose supply requirements were 32,000 pounds per day. Helicopters were stationed at the combat base at the beginning of the fighting. These aircraft became so vulnerable to hostile fire that they had to be kept constantly in the air whether they had missions to perform or not. Eventually losses became so great that this unit was deployed away from Khe Sanh, as helicopters were being lost at a rate faster than they could be replaced. No less than thirty-three helicopters were destroyed or permanently disabled between the beginning of the siege and the end of March, 1968.
These losses were sustained without the implementation of an additional requirement for water delivery. According to the relevant US Army field manual, the water supply requirement for drinking, personal hygiene, food preparation, laundry, and medical treatment is six pounds of water per man per day. These levels provide enough water to support continuous combat operations for extended periods. The implementation of this requirement would have added 158 tons per day, an additional load of 67% over the supply requirement without water. Unlike ammunition and food rations, which could be palletized and delivered by parachute without the need for special containers, water was difficult to stockpile during the periods when resupply was possible, for use when landings were not permitted due to weather or hostile fire. The official optimism of US commanders regarding resupply at Khe Sanh notwithstanding, the Americans would not have been able to provide the base with water under the existing tactical conditions.
Is the author correct in asserting the Khe Sanh could not be supplied from the air with sufficient water if the local water supply was compromised, in addition to the supplies of munitions, rations, fuel, and other essentials? If so, would the Marines really attempt a break-out? Would it not be better to cut down on the supply of munitions and fuel in order to make room for water, and keep defending the base until it can be relieved by ground forces? If American ground forces are diverted to relieve the base, how does this affect the Tet Offensive?
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