The second factor helping to bring the dissociative disorders back into the mainstream was the Vietnam War. For sociological reasons originating outside psychology and psychiatry, the Vietnam War and the posttraumatic stress disorder (PTSD) that arose from it were not forgotten when the veterans returned home, as had been the case in the two world wars and the Korean War. The realization that real, severe trauma could have serious long-term psychopathological consequences was forced on society as a whole by Vietnam. Once this principle was accepted, it as a short leap to the conclusion that severe childhood trauma might have serious sequelae lasting into adulthood.