This mask was painted by a Marine during art therapy to cope with post-traumatic stress symptoms. (Official U.S. Marine Corps photo by Cpl. Andrew Johnston)
This mask was painted by a Marine during art therapy to cope with post-traumatic stress symptoms. (Official U.S. Marine Corps photo by Cpl. Andrew Johnston)

Forty years ago last month, congressional authority to mandate military service expired. We’ve had an all-volunteer military ever since. With just a fraction of able-bodied Americans on active duty—1.4 million today, compared to 9 million during the Vietnam era—this generation of soldiers has endured more and longer deployments than any other generation.

Repeated deployments in Afghanistan and Iraq, studies suggest, have taken a toll on American service men and women. Several studies have found increased rates of post-traumatic stress, depression and other mental health problems among troops who served multiple tours of duty. And suicide rates among those on active duty in the Army and Marines nearly doubled between 2005 and 2009.

Before the wars, suicide rates among service members were 25 percent lower than rates among civilians, attributable in part to universal access to health care. But last year, the Defense Department recorded a record 349 suicides, an average of one a day. Because rates among those serving in the Air Force and Navy remained stable, some reasoned that repeated ground combat tours in Iraq and Afghanistan could be to blame.

But as military psychiatrist Charles Hoge pointed out in a commentary last year, no study had definitively linked factors related to deployment with suicide risk. Although suicide rates rose dramatically since 2001, suicide remains exceedingly rare compared to associated risk factors, making it difficult to assign causes. Hoge, a senior scientist at the Walter Reed Army Institute of Research, said the best way to study the question was to follow individuals over time, beyond their time of service.

Tracking Risk
That’s just what Hoge and his colleagues did in the largest study to investigate this disturbing trend. Their report, financed by the Defense Department and published last week in The Journal of the American Medical Association, is the first prospective study to look at suicides in the military. By following individuals over time, prospective studies can better determine how potential risk factors interact to affect a given outcome.

The researchers analyzed survey data on more than 150,000 active duty and retired service members from all branches as part of the Millennium Cohort Study, designed to assess the long-term effects of military duty on health. Surprisingly, they found no evidence supporting the assumption that deployment factors—including length of deployment, number of deployments and combat duty—independently increases suicide risk. “Instead,” the authors wrote, “the risk factors associated with suicide in this military population are consistent with civilian populations, including male sex and mental disorders.” (Male civilians are four times more likely than females to take their own life, according to the National Institute of Mental Health.)

Several studies have found increased rates of post-traumatic stress, depression, and other mental health problems among troops who served repeated deployments in Iraq and Afghanistan. (Image: Lance Page, via Flickr)
Several studies have found increased rates of post-traumatic stress, depression, and other mental health problems among troops who served repeated deployments in Iraq and Afghanistan. (Image: Lance Page, via Flickr)

The steep increase in diagnosed mental disorders among active duty service members since 2005 parallels the rising rates of suicide, the authors note. “This suggests that the increased rate of suicide in the military may largely be a product of an increased prevalence of mental disorders in this population, possibly resulting from indirect cumulative occupational stresses across both deployed and home-station environments over years of war.”

The increased prevalence of mental disorders could reflect pre-existing conditions or problems that resulted from the stress of military service, Hoge said in an interview. “Suicide rates have risen disproportionately in Army and Marine Corps personnel who have borne the brunt of ground combat operations. But the strain is felt even by those who haven’t deployed who may be coming into units for the first time and experiencing very rigorous training schedules preparing for deployment.”

No Single Factor
Data collection for the study ended in 2008, and so it’s possible, the authors acknowledge, that the cumulative strain of multiple, lengthy deployments wouldn’t have shown up until the later years. Even so, the study included the period that saw the steepest rise in suicides, between 2005 and 2008, and still failed to find specific deployment effects. And because the study links data between military service and post-military life, Hoge told me, it sheds light on the relative importance of risk factors during both phases.

These findings align with several other studies that show similarly small or absent effects of deployment on suicide risk, says Craig J. Bryan, associate director of the National Center for Veterans Studies at the University of Utah. Bryan, who was not involved in the study, calls it “probably the most reliable study to date on this matter,” citing its “very large sample” and use of death by suicide as the primary outcome (rather than suicidal thoughts or attempts).

Bryan says the study does not suggest that deployments never contribute to suicides in the military. “Without a doubt, deployments are an important risk factor in some cases. But if we focus exclusively on deployments, we will miss the bigger picture of suicide risk in the military.”

We’ve known for years that mental health problems are better predictors of suicide, Bryan adds. More than 90 percent of people who take their own life suffer from a mental or substance-abuse disorder, according to the National Institute of Mental Health.

“But being in the military is more stressful now than it was 15 years ago, even if you haven’t deployed,” says Bryan. “Many service members now live in a state of chronic stress, which increases their risk for mental health problems and suicide. Assuming that deployment is the only source of stress for military personnel, however, is a gross oversimplification that overlooks the realities of everyday life in the military.”

Bryan hopes this study helps people understand that general assumptions about suicide can be wrong. He and his colleagues just finished a study, not yet published, that flags suicide attempts before military service as the strongest predictor of risk after enlisting. The findings could reflect the fact that some people have difficult, chaotic, troubled childhoods that increase risk for suicide attempts at a young age, he says. Vulnerable individuals might join the military as an escape from difficult lives, as an attempt to “make something of myself” or because they feel they have no other choice.

What’s needed to prevent these tragic outcomes, Bryan says, is a timeline that maps all the possible trajectories between mental health, deployments and suicide. “We need to make sure we’re aiming at the right target,” he says. “Otherwise, we’ll continue to miss the mark.”

Rising Rates of Military Suicides Reveal Complex Effects of Service on Soldiers’ Health 15 August,2013Liza Gross


Liza Gross

Liza Gross, an award-winning independent journalist and senior editor at the biomedical journal PLOS Biology, writes mostly about conservation and public and environmental health. She was a 2013 recipient of the NYU Reporting Award, a 2013 Dennis Hunt Health Journalism fellow and a 2015 USC Data Journalism fellow.

Read her previous contributions to QUEST, a project dedicated to exploring the Science of Sustainability.

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