Constant troop training can also rattle rivals.
Gunman complained about symptoms relating to post traumatic stress disorder, but experts say combat not always to blame.
A soldier with mental health issues killed three people and wounded 16 before turning the gun on himself.
Korea is the latest nation to enter the territorial fight with its neighbors.
Critics say firing weapons from behind a computer screen, while safely sitting thousands of miles away, could desensitize pilots to the act of killing.
To try to lower growing suicide rates in the military, a new computer program predicts soldiers most at risk. Continue reading →
Old conspiracy claims about the crash of TWA Flight 800 have resurfaced; what keeps conspiracies alive? Continue reading →
Research into the detection of a radioactive isotope in Russia and Japan has been withdrawn pending further study. ->
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