According to the "Command History USS Collett, DD 730 Westpac deployment 1966-1968" document, the weapons delivery systems of the "Collett" during this time were three 5 inch/38 twin mounts, two fixed and trainable torpedo tubes, two hedgehog mounts, and DASH (Drone Anti-Submarine Helicopter). The ship was again home-ported in Yokosuka, Japan, 1966-1968, and performed a variety of combat missions in the Gulf of Tonkin. Her assignments included Search and Rescue (SAR), Naval Gunfire Support (NGFS), Operation Sea Dragon, and plane guarding for carriers. During her deployment, "Collett" was taken under fire by North Vietnamese shore batteries on five separate occasions. The ship was one of the few American vessels to serve with both HMAS Perth (D 38) and HMAS Hobart (D 39) of the Royal Australian Navy.