“It’s the worst experience that I've ever had to go through and had to live with, and it's not something you ever get over.”
Ms Jamieson and her son migrated to Australia from England in 2006. Joining the army was all he ever wanted to do, she said.
Private Daniel Garforth was part of the 5th Battalion, Royal Australian Regiment, stationed at Darwin.
But things soon deteriorated.
“He felt trapped and very isolated and helpless, which put him at risk. Most defence personnel don't really want to reach out for help, they fear being seen as weak."
“And then suddenly, he suicided, in November 2014.”
Daniel was just 21.
A 2018 study published by the Department of Veterans’ Affairs, and described as the largest study undertaken to examine the impact of military service, found people leaving the Australian Defence Force had much higher rates of mental disorders including anxiety, panic attacks, depression and drug and alcohol dependence.
Nearly half of all those leaving the force experienced a mental disorder within five years.
The Australian Institute of Health and Welfare has also reported more than 400 suicides in the defence and veteran communities since 2001.
But Ms Jamieson, a former social worker who began researching mental health issues in veterans after her son's death, said the true figures may be much higher.
“I'd say we're in almost epidemic proportions," she said.
“There are many, many, many people out there who suffered and ended their life [using] mechanisms that are not considered the traditional suicide methods, therefore they're not captured.”
'It stays with you forever'
Greg Carter was diagnosed with PTSD after serving with the 6 Battalion, Royal Australian Regiment, in Vietnam in 1969. He said he knows of many suicides among returned soldiers.
“It makes me extremely angry that people who’ve served have taken their life, it is very sad,” the 71-year-old said.
Mr Carter now runs a rural retreat for retired soldiers in Victoria called Cockatoo Rise, helping those struggling to manage their stress disorder.
“No matter where you served - Vietnam, Korea, Iraq or Afghanistan - when you are in a warzone, your life is changed,” he said.
“If you have feared for your life on a day-to-day basis, that stays with you forever.
“Once you have been shot at, the possibility of dying becomes very present in your mind.”
He said he is still haunted by images of the battlefield but says a positive outlook has helped him manage things.
“Others living with PTSD in our veteran community sadly don’t deal with it very well at all,” he said.
Mr Carter has an extensive museum of military memorabilia and is now restoring a 160-year-old bluestone pub near Warrnambool as a sanctuary "for anyone who has worn a uniform".
Meet the veteran helping other Anzacs with PTSD
“This retreat isn’t here to heal people, it gives veterans an opportunity to talk with other vets,” he said.
“If this retreat can save someone’s life, and I’ll probably never know, to me that’s what it’s all about, being able to help in that way.”
In February, Prime Minister Scott Morrison announced a permanent national commissioner would be appointed to investigate suicides among defence force personnel and veterans.
The commissioner is expected to deliver a report to parliament within 12 months.
"Those veterans and all serving men and women protect our community and our freedoms. It is our duty to do the same for them," Mr Morrison said.
He also announced a Veteran Family Advocate would be established to represent families impacted.
Ms Jamieson had been pushing for a Royal Commission into veteran suicides.
“I’ve completed a Master’s degree in suicide because I wanted to do more for veterans," she said.
“My hope is that I can reduce veteran suicide and ultimately save another family from living with such heartache.”
Earlier this year, Ms Jamieson earned a PhD scholarship to continue researching the link between Moral Injury (MI), a new concept in Australia, and suicide among veterans.
Ms Jamieson defines Moral Injury as a violation of moral codes, which can lead to deep feelings of betrayal, anger, guilt and shame, and heighten the risk of suicide in serving and ex-serving military personnel.
She believes MI is often mistakenly labelled as PTSD and it may explain why many veterans diagnosed with PTSD do not respond to conventional treatments.
She hopes the work can be expanded to incorporate those working on the front lines in other professions.
“Our doctors, nurses, paramedics, first responders, even our volunteers who were in the bushfires recently, anybody who makes a split-second decision or anything that impacts on our core moral foundation is at risk of a Moral Injury,” she said.
Saturday will see Anzac Day marked across the country.
The cancellation of events due to COVID-19 bans on mass gatherings could be distressing for some veterans, Ms Jamieson said, urging people to reach out to friends and family who have served.
“It's a really difficult time. It can be really triggering and for some people," she said.
“For those people who do put a lot of emphasis on the day, there is a potential for mental health impacts."
Australia's Anzac Day national dawn service will be live-streamed and available to watch afterwards on SBS News's website, app and Facebook page from 5.30am on Saturday.
Readers seeking support can contact Lifeline crisis support on 13 11 14, Suicide Call Back Service on 1300 659 467 and Kids Helpline on 1800 55 1800 (for young people aged 5 to 25). More information is available at Beyond Blue.org.au and lifeline.org.au.
People in Australia must stay at least 1.5 metres away from others and gatherings are limited to two people unless you are with your family or household.
If you believe you may have contracted the virus, call your doctor (don’t visit) or contact the national Coronavirus Health Information Hotline on 1800 020 080. If you are struggling to breathe or experiencing a medical emergency, call 000.
SBS is committed to informing Australia’s diverse communities about the latest COVID-19 developments. News and information is available in 63 languages at sbs.com.au/coronavirus