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British soldiers who have served in Iraq and Afghanistan - particularly young men and those who have seen active combat - are more likely to commit violent crimes than their civilian counterparts, according to research published on Friday.
Researchers said the findings could help military officials improve their risk assessment of violence among serving and ex-military personnel.
They stressed that although the study points to a serious problem for those affected, it does not mean all ex-soldiers will become violent criminals.
"Just as with post traumatic stress disorder, this is not a common outcome in military populations," said Professor Simon Wessely, co-director of the Centre for Military Health Research at King's College London, who co-led the study.
"Overall you must remember that of those who serve in combat, 94 percent of those who come back will not offend."
The study found that those in combat roles were more than 50 percent more likely than those in non-combat roles to commit assaults or threaten violence after returning.
The problem was particularly striking among young men. Of around 3,000 soldiers aged under 30, more than 20 percent had a conviction for violent offences, compared with only 6.7 percent of civilian men in the same age group.
The study also highlights mental health problems in the military, and issues of alcohol abuse, post-traumatic stress disorder and aggressive behavior, the researchers said.
Violent offending was most common among young men from the lower ranks of the army, said Deirdre MacManus from King's College London, who led the work and presented the results at a briefing in London.