Returned servicemen and women can sometimes come back from active duty and be damaged physically, mentally and emotionally.
It can be really difficult to get their minds back to a healthy place and options for treatment are limited in Australia.
But hopefully another option could be on the table as a medicinal cannabis trial kicks off in Australia to see whether the drug can help veterans battling PTSD.
It'll be coordinated by Cannabis Access Clinics and will run for one year.
Lead researcher Dr Sharron Davis said: "It can present itself in lots of different ways, so it's very difficult to find a treatment that is going to treat all of the symptoms of PTSD.
"We have to be able to show the Therapeutic Goods Administration that these people have tried everything conventional medicine has to offer."
Researchers are looking for 300 people across Australia to take part in the study.
According to the Aussie Department of Veterans Affairs, between five and 10 percent of the regular community will develop PTSD at some point in their life, while veterans are between five and 20 percent likely.
The DVA recognises that a third of people greatly benefit from therapy services, the second third requires longer treatment and the last third are unlikely to benefit significantly.
It's hope that this trial will address that last third of people who feel they have nowhere else to turn.
Global health and wellness business BOD will be working with Cannabis Access Clinics for the trial and spokesperson Jo Patterson is excited to see the results.
"They might be on the product for up to five weeks - obviously it's an observational trial, so they'll assess the benefits that the product is offering the patient," Ms Patterson said.
Cannabis isn't the first drug proposed for helping people with PTSD.
Clinical trials are already underway (and have been for quite some time) to see whether MDMA or ecstasy can help people. The drug can provide users with feelings of euphoria and also make them a lot chattier, meaning they might open up more about their feelings than usual.
Another is psilocybin or magic mushrooms, with researchers looking into whether the chemical makeup of the drug can sort of rejig a patient's brain and the way they see things.
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