26 sailors who survived a Kamikaze attack during the battle for Okinawa in World War II were given two adapted forms of the Posttraumatic Stress Disorder Checklist-Civilian to assess the psychological reactions they had to the sinking of their ship. Depending on the assessment criteria used, their responses indicated significant stress reactions ranging from 8.3% to 44% of the sample. The findings provide evidence that a single combat experience can have lifelong, averse psychological effects.