In August 1966, "Goldsborough" entered the Pearl Harbor Naval Shipyard for overhaul and extensive modification. In 1967 she participated in "Operation Sea Dragon", designed to interdict the North Vietnamese lines of supply into the Republic of Vietnam, and provided Naval Gunfire Support along the DMZ. During this deployment "Goldsborough" fired nearly 10,000 rounds in support of allied forces and avoided over 800 rounds of hostile fire without damage to the ship. She was awarded the Naval Unit Commendation for exceptionally meritorious service in Vietnamese waters from 29 August 1967 to 17 February 1968 upon her return to Pearl Harbor.