A recent survey of 1,200 Vietnam veterans headed up by researchers from U.C. San Francisco and the San Francisco VA Medical Center reports that soldiers who killed people during that combat have, on average, lived far more troubled lives in the ensuing decades than soldiers who did not. Even when compared with fellow combat veterans -- not pencil pushers -- soldiers who reported taking others' lives had higher incidences of post-traumatic stress disorder, violent behavior, troubles with daily