The squadron remained at Da Nang until February 1965. They embarked aboard the on March 7, 1965 to support the 7th Fleet's Special Landing Force until April 27. HMM-365 returned to Da Nang on May 15 and remained until relieved in August 1965. The squadron flew over 12,000 mishap-free hours in support of heavy combat operations. On September 1, HMM-365 was reassigned to Marine Aircraft Group 26, MCAS New River, North Carolina. For its service in Vietnam, the squadron was awarded the Presidential Unit Citation and the Navy Unit Commendation.