Ex-cop Jim Morrison will return to Port Arthur later this month for the first time since the devastating massacre in 1996.
The former tactical commander of the Tasmanian Special Operations Group will complete The First Responders Walk from Melbourne to Hobart, raising funds for the Alannah & Madeline Foundation.
The foundation was setup in memory Alannah and Madeline Mikac, who were aged six and three when they were killed with their mother during the mass shooting.
Mr Morrison will drive in a support vehicle while former Victoria Police SOG tactical team leaders Craig Harwood and Michael Hayes, who were also involved in the Port Arthur operation, will walk the 410-kilometre journey.
"We are here to keep children safe from violence, and do what we can to ensure every child will live in a safe and supportive environment," Mr Morrison said.
"I have become more aware of what the foundation does and I'm very impressed, so I'm proud to be a part of this event."
For Mr Harwood, it was not about them, but instead an opportunity to represent all first responders who were involved in the tragedy, while also raising awareness for children at risk.
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"We were part of two teams that came down from Victoria Police SOG to deal with that situation," he said.
"It was a long time ago, but one amazing thing that has come out of such a terrible incident has been the Alannah & Madeline Foundation.
After the walk, on the day of the anniversary, the group planned to return to the site to pay respect to the victims, and survivors.
"It will be a precious moment going back with the two other members that I served with," Mr Morrison said.
"I have been back to Tasmania, we have family down there, it is close to my heart, my children were born there, but I deliberately stayed away from the Tasman Peninsula."
The team head off on their 12-day journey on Friday, having already raised more than $70,000.
Their target was $100,000, which would provide about two years' worth of the foundation's Buddy Bags for children in emergency accommodation.
Not only does the charity provide the bags, but it has delivered practical programs in thousands of schools across the country, and created online safety tools to protect children since it began.
The foundation also joined forces with Dolly's Dream, an organisation created in memory of 14-year-old Amy 'Dolly' Everett, who tragically lost her life to bullying.
To donate to the walk visit www.mycause.com.au/events/firstresponderswalk.