In Vietnam, where the decision was being made, there was little disagreement. The two key figures, General Westmoreland and General Cushman, "after discussing all aspects of the situation, were in complete agreement from the start."(64) There were several reasons they decided to hold Khe Sanh at that time. The base and adjacent outposts commanded the Khe Sanh Plateau and the main avenue of approach into eastern Quang Tri Province. While the installation was not 100 percent effective as a deterrent to infiltration, it was a solid block to enemy invasion and motorized supply from the west. Had the Allies possessed greater strength in the northern provinces, they might have achieved the same ends with large and frequent airmobile assaults--a concept which General Cushman had advocated for some time. In January 1968, he had neither the helicopter resources, the troops, nor the logistical bases for such operations. The weather was another critical factor because the poor visibility and low overcasts attendant to the monsoon season made helicopter operations hazardous to say the least. Even if the III MAF commander had the materiel and manpower for such large airmobile assaults, the weather precluded any such effort before March or April. Until that time, the job of sealing off Route 9 would have to be left up to the 26th Marines.(65) An additional consideration for holding the base was the rare and valuable opportunity to engage and destroy an, heretofore, elusive foe. Up to this time, there was hardly a commander in Vietnam who, at one time or another, had not been frustrated in his attempts to box in the slippery NVA and VC units. At Khe Sanh, the enemy showed no desire to hit and run but rather to stand and fight; it was a good idea to oblige him. In effect, the 26th Marines would fix the enemy in position around the base while Allied air and artillery battered him into senselessness. Furthermore, the defense was envisioned as a classic example of economy of force. Although there was conjecture that the NVA was trying to draw American units to the DMZ area, the fact remained that two crack NVA divisions, which otherwise might have participated in the later attacks on Hue and Quang Tri City, were tied down far from the vital internal organs of South Vietnam by one reinforced Marine regiment.(66) Thus, with only two choices available--withdraw or reinforce--ComUSMACV chose the latter. In his "Report On The War In Vietnam," General Westmoreland stated: