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17 January, the 1st Brigade, 1st Cavalry Division began its deployment to Phu Bai.78

On that same dace. General Westmoreland explained to a gathering of his senior field commanders the reasons for the reinforcement of III MAF north of the Hai Van Pass. He believed char the NVA was about to move against Khe Sanh and also against allied forces in the coastal areas of southern Quang Tri and northern Thua Thien Provinces from Base Area 101. As he had earlier observed to Admiral Sharp and General Wheeler, 'the odds are 60-40 that the enemy will launch his planned campaign prior to Tet.' He told the assembled officers that he realized the tenuous logistic situation, but that the risk had to be accepted. He was especially worried about the lack of a deep-water port and the vulnerability of Route 1 between Da Nang and Hue. He believed that it would take about another regiment to secure the highway.79

General Westmoreland was also concerned about command relations, especially in control of air. MACV and III MAF staff officers had already started to address this problem in the initial planning for York II in the A Shau and for an air offensive in support of the Marine base at Khe Sanh, codenamed Operation Niagara. The questions still remained unresolved, however, with deep doctrinal differences between the Marines of III MAF and Seventh Air Force officers representing MACV. Although the MACV air directive called for the Marine wing, operating under III MAF control, to support Marine units and the Seventh Air Force to provide support for Army units, Westmoreland was not sure that the system would work with the 1st Air Cavalry Division deployed north of the Hai Van Pass.80

On 19 January, General Westmoreland visited General Cushman and Major
General Norman J. Anderson, the commander of the 1st Marine Aircraft
Wing, at Da Nang. The MACV commander brought up the issue of air support
for the Cavalry Division in its new area of operations. According ro
Westmore-




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