Military Service, Even Without Combat, Can Change Personality and Make Vets Less Agreeable, Research Suggests

It's no secret that battlefield trauma can leave veterans with deep emotional scars that impact their ability to function in civilian life. But new research led by Washington University in St. Louis suggests that military service, even without combat, has a subtle lingering effect on a man's personality, making it potentially more difficult for veterans to get along with friends, family and co-workers.

"Our results suggest that personality traits play an important role in military training, both in the sort of men who are attracted to the military in the first place, and in the lasting impact that this service has on an individual's outlook on life," says study lead author Joshua J. Jackson, PhD, an assistant professor of psychology in Arts & Sciences.

Published in the journal Psychological Science, the study found that men who have experienced military service tend to score lower than civilian counterparts on measures of agreeableness -- a dimension of personality that influences our ability to be pleasant and accommodating in social situations.

The study confirms that the military attracts men who are generally less neurotic, less likely to worry, less likely to be concerned about seeking out novel experiences. When compared with men in civilian pursuits, those entering the military also are more aggressive, more interested in competition than cooperation and less concerned about the feelings of others, the study finds.

"Military recruits are a little less warm and friendly to begin with and the military experience seems to reinforce this -- as after service, men score even lower on agreeableness when compared to individuals who did not go into the military," Jackson says. "Interestingly, this influence appears to linger long after the soldier has re-entered the workforce or returned to college."

Jackson points out that being less agreeable is not always a negative human trait. While it may make it more challenging to maintain positive relationships with friends and romantic partners, it can be seen as a positive influence on career success.

"On the flip side," he says, "people with lower levels of agreeableness are often more likely to fight their way up the corporate ladder and to make the sometimes unpopular decisions that can be necessary for business success."

Either way, this study offers evidence that experiences in basic training and other military service do shape the way people approach the world.

"These changes in personality appear to be small, but they could make a big difference in the lives of those who have served in the military," he says.

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