The article focuses on three senior decision-makers in the John F. Kennedy and Lyndon B. Johnson administrations that each played a key role in the escalation in Vietnam, namely Walt W. Rostow, Roger Hilsman, and John T. McNaughton. It builds on Andrew Preston’s argument in this journal that the dichotomy between ‘hawks’ and ‘doves’ might caricature Vietnam War advisors to suggest the same for the dichotomy between ‘civilians’ and ‘veterans’. Using new material, most notably McNaughton’s wartime diaries and Hilsman’s OSS files, the article suggests that wartime experience was clearly an important formative experience for civilian advisors but in different ways. First, where political scientists tell us that veterans are more likely to espou...