This article is part of The Unremembered, a Globe and Mail investigation into soldiers and veterans who died by suicide after deployment during the Afghanistan mission.

They were sons of bankers, miners and infanteers. They were strongmen and endurance runners. They were husbands and fathers who took their children camping and taught them how to play shinny on backyard rinks.

All 31 were dedicated Canadian soldiers and airmen who served on the perilous Afghanistan mission. They all came home. All ended their lives.

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Most were haunted by the things they saw and did in Afghanistan, their families told The Globe and Mail. Many asked the military for help, but in several cases, their medical assessments and treatment were delayed, even as their post-traumatic stress, depression and sleeplessness worsened.

Read more: The Unremembered: Remembering 31 Canadian Afghanistan war veterans lost to suicide

Read more: The Unremembered: Where to get mental-health help in Canada

Read more: The Unremembered: Behind the story: How The Globe set out to commemorate Afghanistan war veterans lost to suicide

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The families of the 31 fallen spoke to The Globe as part of a collaborative effort to commemorate military members and veterans lost to suicide after serving on the Afghanistan mission, Canada's longest military operation. Many are speaking publicly about their loss for the first time. And for many of the military members, this is the first public recognition of their sacrifice.

Together, their stories paint a disturbing picture of delayed care, ineffective medical treatment and insufficient mental-health support. The 31 accounts are the most comprehensive public record of Canada's Afghanistan war veterans lost to suicide – unwitting monuments to a system that is failing too many vulnerable soldiers and veterans.

The 31 fallen are part of a larger troubling statistic. A continuing Globe and Mail investigation has uncovered that at least 70 soldiers and veterans died by suicide after returning from the Afghanistan operation – nearly one-third higher than the 54 revealed by the newspaper one year ago.

Many of their deaths are linked to the Afghanistan mission but they are not counted in Canada's official toll of 158, which includes six soldiers who killed themselves in theatre. In many ways, they are forgotten casualties of the Afghanistan war, and too often they suffered in silence.

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"You don't want to know what I did there or what it was like there," Captain Linden Mason told his sister, Jade, after he returned from Kandahar in December, 2010. Her brother had always been her protector, but now he seemed angry and disconnected, and was plagued by nightmares. "You hear about the deaths," he told his sister, "but you don't hear how many people are getting hurt or what it's like, what we see." He ended his life 13 months after returning from Afghanistan.

Corporal Tony Reed didn't want to talk either, until one day in frustration, he told his mother: "I cannot go to sleep, Mom, because as soon as I close my eyes that's what I see, okay? People being blown up. Little kids with grenades. The blood. You can't imagine the blood that I've seen over there." Cpl. Reed, who was diagnosed with PTSD, died by suicide on Dec. 7, 2012.

The two soldiers are part of a mounting count that includes five members and veterans who took their lives this year and several former soldiers not previously identified by The Globe's investigation.

The Globe asked families a series of questions for profiles and data analysis. Among these 31 military members and veterans, there are many haunting similarities. In all but six cases, families saw indelible scars left by the Afghanistan battle. In the other instances, there was uncertainty about the health status or other factors that contributed to the mental crisis.

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Among the key findings:

Suicide is complicated and rarely caused by one factor. But PTSD and depression are treatable, which means it can be prevented.

Although several stresses contributed to the deaths of the 31 fallen, it is clear many were struggling with the after-effects of the Afghanistan war. The Forces only last year acknowledged that deployment may be emerging as a risk factor for suicide, noting there has been a "significant increase in suicides" among those in combat roles and under army command. However, a military spokesperson added that: "We have not been able to identify any specific deployment, including Afghanistan, to be the sole cause of a suicide."

Neither the Canadian Forces nor the federal government regularly monitor suicides of former military members, but Veterans Affairs last year publicly committed to annually tracking vet suicides for the first time. The inaugural report is expected in December, 2017.

Veterans Affairs and National Defence are working together on a suicide-prevention strategy, mandated by Prime Minister Justin Trudeau last year after The Globe's initial investigation of military suicides. A draft plan won't be ready until next fall. An expert panel is currently reviewing mental-health programs and suicide-prevention activities to determine whether improvements are needed.

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"It is difficult for all Canadians to hear that our military men and women and our veterans are taking their own lives," said Veterans Affairs spokesman Zoltan Csepregi. "One suicide is one too many, and we have to do better."

After last fall's suicide-prevention directive from the Prime Minister, an external review of the Forces' health services has finally started in earnest. An expert panel has been asked to evaluate the military's mental-health programs and suicide-prevention activities and to determine whether they are sufficient.

The panel, whose membership wasn't released, met for the first time in late October. It's unclear when the panel will deliver its recommendations, but according to its contract with the Forces, the panel will only examine programs under the military's health-services branch.

The last review of the military's suicide-prevention programs was in 2009. That evaluation led to 59 recommendations. Veterans Affairs is participating in the review and in the development of a suicide-prevention strategy.

Retired Lieutenant-Colonel Stéphane Grenier, who created a mental-health education program for the military in 2007, contends the Forces have been too slow to acknowledge the suicide problem. He believes more resources should be invested in social support and expanding mental-health treatment beyond doctors and pills.

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"We keep spinning our wheels with suicide and we're really failing to go the distance," said Mr. Grenier, who deployed on numerous missions, including to Rwanda and Afghanistan, during his 29-year military career. He is now a consultant on mental health.

"The suicide issue, as serious as it is, is the tip of the iceberg," he said. "How many other veterans never kill themselves, but literally fall through the cracks, end up homeless and ill to the point where they're never productive ever again?"

Antoon Leenaars, a psychologist and consultant on suicide prevention in Windsor, Ont., said it's important to make military suicides visible, so that care can improve for soldiers and their families. He encouraged members dealing with mental illness to seek help.

"There is hope. They don't need to suffer in silence," he said.

Author of Suicide Among the Armed Forces, Dr. Leenaars suspects the suicide count among soldiers who served in Afghanistan is higher than 70. He urged the military and Veterans Affairs to take a holistic approach to treating mental illness and include families when caring for traumatized soldiers.

"You have to include the family and the children because there is secondary trauma," he said. "It's like walking on eggshells."

With data analysis by Jeremy Agius

If you would like your relative included in the commemoration project of Afghanistan war veterans lost to suicide, please e-mail remember@globeandmail.com