 "Henderson" then spent three months off Vietnam, supporting riverine operations and participating in "Operation Ringmaster I".During this period, the destroyer also rescued six passengers from an SH-3 Sea King helicopter that crashed while en route from Da Nang to .Returning to Long Beach on 8 May, "Henderson" underwent several months of inspections and certifications, which ultimately kept the warship in service in contrast to the mass 1970s decommissioning of many of her war-built sister ships.