 During the FRAM I conversion, the destroyer received an entirely new superstructure — designed to protect the ship against biological and chemical agents as well as radioactive fallout — and the Antisubmarine Rocket (ASROC) system.Returning to full commission on 31 July 1965, "Herbert J. Thomas" completed her FRAM I conversion on 30 August (reverting to DD-833 on 1 April 1964) and operated along the West Coast until sailing for the Far East on 14 September 1966.Arriving at "Yankee Station" off South Vietnam on 16 October, she joined CTG 77.7 in screening during strikes against communist targets ashore.