I have included a link here to Don Dodsons account from the standpoint of the USS Coontz (DLG-9) for discussion purposes.http://uss-king.com/ptboat-dlg9.shtml
Also from the Naval Historical Center - USS Constellation (CV-64)
Constellation returned 1 February 1965. Her crew was awarded the Navy Unit Commendation and the Armed Forces Expeditionary Medal for actions in the Gulf of Tonkin. Constellation again deployed to the western Pacific from her home of San Diego on 12 May 1966 with Carrier Air Wing 15. On 1 July, three North Vietnam torpedo boats came out to attack USS Coontz (DLG 9) and USS Rogers (DD 876) operating about 40 miles off shore on search and rescue missions. Aircraft from Constellation and USS Hancock (CVA 19) made short work of the attackers, sinking all three with bombs, rockets, and 20mm cannon fire. After the attack, Coontz pulled 19 survivors from the water. Constellation returned from the WESTPAC deployment on 3 December 1966.
On 1 July, Hancock and Constellation were at Yankee Station, and Oriskany was at Dixie. Aircraft from Yankee CVA's hit POL storage areas in the Hanoi/Haiphong complex for the third consecutive day. At Dong Nham, 13 miles northwest of Haiphong, 15 naval aircraft destroyed seven POL tanks and four support buildings.
On the same day, an F-4 BARCAP sighted three high speed surface contacts closing three U.S. destroyers on SAR station in the Gulf of Tonkin. The northern SAR commander in Coontz (DLG 9) was notified, and air support was requested. The targets, identified as PT boats, were taken under attack by two F-4s, four A-4s and two A-6s from Constellation All boats were sunk. One F-4 was damaged, but all planes returned safely to base.
Also from Destroyer Museum website
The first day of 1965 found Gurke with Task Group 77.7 in the South China Sea. Long hours were spent on station, plane-guarding for attack carriers Ranger (CVA 61) and Hancock (CVA-19). As the Vietnam conflict became "hot" in late January she served as one of the escorts for an amphibious task group in the vicinity of Da Nang, South Vietnam. Long stretches at sea with fast carriers were punctuated by liberty calls at Subic Bay and Hong Kong. On 20 April 1966 the destroyer sailed in company with Ranger (CVA-61) for return to San Diego, 7 May 1966. The remainder of the year was filled with a rapid succession of coastwise training exercises ranging north to Seattle, which continued until she sailed for the western Pacific 12 May 1966. After visiting Hawaii, Japan, and the Philippines, Gurke was stationed in the Gulf of Tonkin late in June for search and rescue duty. On 1 July three North Vietnamese PT boats were detected 11 miles away from Gurke and three sister destroyers and closing at high speed. Fighter aircraft from Constellation intercepted the raiders and sank all three within minutes. The destroyers picked up 19 survivors for questioning.
and from USS Gurke website