But it's not just soldiers who are at risk.
Bushes can suddenly mutate into piles of corpses.
I can't stand the loudness of silence,'' says the retired Canadian general who commanded the United Nations mission to Rwanda during the 1994 genocide, when up to a million Tutsis were butchered by the ruling Hutus. Two years after he returned to Canada, he could no longer suppress his memories of the sounds, sights and smells of the horrors he witnessed in Africa. He tried to kill himself. But he didn't accept treatment until 1998. Dallaire's illness used to be called shell shock, a term coined in 1940 by British psychologist Charles Myers, who attributed the symptoms of mental breakdown to the concussive effects of exploding shells.