In this oral history interview, Marshall Space Flight Center engineers Toon Ferrell and Tom Lewis discuss the development, testing, and operational history of the Saturn rocket engines—particularly the F-1, J-2, and H-1—drawing on their experiences overseeing engine programs during the Apollo era. They explain technical topics including engine ignition systems, furnace brazing techniques, thrust uprating through gas-generator orifice changes, acceptance and static-fire testing, and the challenges of engine reliability, restart capability, and combustion stability. The interview also examines significant engineering issues such as the J-2 augmented spark igniter (ASI) failure caused by unrecognized vacuum-induced flex-line vibrations, quality control problems with H-1 turbine blade materials, and the rationale for extensive engine and stage testing at Rocketdyne and Marshall. Throughout the discussion, Ferrell and Lewis emphasize the complexity of liquid-fueled rocket engine development, the importance of rigorous testing and systems integration, and the often subjective or politically influenced decisions surrounding testing strategies, while also reflecting on how lessons learned from failures were shared across NASA, the Department of Defense, and industry to improve reliability and advance rocket propulsion technology.]]>