"Biddle" completed a two-week tender availability on 27 September and departed Yokosuka for the combat zone. Steaming by way of Subic Bay, she arrived back on Yankee Station on 2 October. Between the 2d and the 6th, Commander, Destroyer Squadron (ComDesRon) 3, rode in "Biddle" and served as antiair warfare coordinator for Task Force (TF) 77. On the 6th, the warship resumed PIRAZ duty, relieving "Jouett". For almost a month, she operated alternately as PIRAZ ship and as strike-support and search-and-rescue ship. Relieved by the cruiser on 27 October, "Biddle" put into Hong Kong on 29 October for a six-day liberty call. The guided-missile frigate departed Hong Kong on 4 November, made a fuel stop at Subic Bay, and then headed back to Vietnam.