"Why he unraveled remains a mystery. But the authorities have started to explore one possible answer: that Mr. Card's brain may have been damaged by his time in the Army."
"For generations, the military assumed that the blast waves that troops experienced from firing weapons or throwing grenades in training posed no danger to them. It is only in the last few years that increasing evidence of harm from repeated exposure, along with mandates from Congress, has driven the Defense Department to start trying to track, study and understand the impact of blast exposure."
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