Caputo served as a casualty reporting officer during the Vietnam War. This role required him to record in extensive detail all enemy and friendly casualties, no matter the cause of death. He had to use clinical and euphemistic language preferred by the military to describe wounds and deaths. Caputo found this job distressing as it gave him bad dreams and destroyed his romantic ideas about war. He felt like "death's bookkeeper" due to the immense number of deaths he had to record each day.