 A week later, the 198th Infantry Brigade (Light) moved from Đức Phổ to Chu Lai, relieving the 196th Infantry Brigade, which moved into the southern part of the Wheeler-Wallowa zone.With the arrival of Gelling's brigade, General Matheson flew his 1st Brigade, 101st Airborne Division, down to Phan Rang Air Base for a month-long mission in southern II Corps.On 22 November a US radio research unit picked up a transmission apparently sent by the headquarters of the PAVN 3rd Regiment.