The RAN did not deploy operationally until 1965, but in 1962 and made goodwill visits to Saigon. They were followed a year later by similar visits by and . In 1967, became the first RAN destroyer to be operationally deployed to Vietnam. "Hobart" served three tours in Vietnam from March to September in 1967, 1968, and 1970. During her operations, she fired 10,000 rounds at 1,000 shore targets and came under fire around 10 times, including on one occasion by a United States F-4 Phantom. "Hobart" was awarded the United States Navy Unit Commendation in recognition of her service in Vietnam, while sister ship received both the United States Navy Unit Commendation and the Meritorious Unit Commendation. Clearance Diving Team 3 was awarded the US Presidential Citation, two US Navy Unit Commendations and a US Meritorius Unit Commendation. The only non US Unit to ever receive all 3 awards. After their five years of service in Vietnam, the four gunline destroyers; "Perth", , "Hobart" and steamed over 397,000 miles and fired 102,546 rounds.