On 3 January 1955, Catamount cleared for the Far East once again, arriving at Yokosuka 25 January. Almost at once she sailed for the Taiwan Straits to take part in the evacuation of the Tachen Islands early in February. She returned to San Diego 24 April. After local operations, she spent 16 January to 30 August 1956 in the central Pacific in Operation Redwing, a series of nuclear tests. In the summer of 1957, Catamount sailed from Seattle on resupply missions to stations of the Distant Early Warning Line (DEW Line) in the Arctic.
