On 6 June, Vancouver began a combat operation, code named Operation Swift Sabre. The SLF moved ashore in two groups. One group assaulted beaches in landing craft while the other group flew well inland in helicopters. Both groups then began moving toward one another in a sweep of Elephant Valley in Thừa Thiên Province to eliminate a frequent source of hostile mortar fire on the Da Nang Air Base. After supporting the Marines for a week, Vancouver received a replacement SLF, BLT 2nd Battalion, 7th Marines, when BLT 3/1 changed operational control to military authorities ashore. The new battalion landing team came on board on 14 and 15 June, and Vancouver set a course for the Philippines on 15 June. She entered Subic Bay on 18 June and began a ten-day upkeep period. Between 30 June and 3 July, the ship participated in the amphibious exercise "Hilltop XX" and then departed Subic Bay on 6 July for her last tour of duty in Vietnamese waters during the 1968 deployment.
