This film and its themes can in many ways be seen as an early reflection of the popular awareness of the effect of combat trauma on soldiers that the Vietnam War helped bring to light. Much of Andy's disposition and symptoms, e.g. sudden violent behaviour due to the re-living of traumatic experiences, would later be associated with Post-Traumatic Stress Disorder, defined by the American Psychiatric Association in the Third Edition of the Diagnostic and Statistical Manual of Mental Disorders (1980).