Prince Harry and Meghan Markle attended the opening ceremony of the Invictus Games at the Sydney Opera House forecourt on Saturday night.
The ceremony was delayed by an hour after the city was lashed by a late afternoon thunderstorm.
The Invictus Games, Harry's brainchild and the focus of this tour, were founded by the prince in 2014.
The sporting event gives sick and injured military personnel and veterans the opportunity to compete in sports such as wheelchair basketball and to find inspiration to recover.
For Ben Peckham, post-traumatic stress surfaced when those around him noticed strange behaviour, like preferring to sleep on the street and being agitated.
"I hit rock bottom some years after leaving the service," he said.
Taking part in the Invictus Games in discus is part of Mr Peckham's journey back to health, but the number of returned defence personal with PTSD is unclear as not every puts their hand up.
But Gareth Pratt said that is changing as Princes William and Harry bring it to the fore.
"They both must have friends and comrades and other servicemen that they have seen gone through it, so their ability to use it for a tool and to promote others - yeah thank you. I just thank them," he said.
Mr Pratt was working on the frontline as an army medic when he realised he was displaying the same signs he was telling others to get counselling for.
He is co-captaining the Kiwi Invictus team and it is just as much about building mental strength as physical.
"The one thing I learnt is the routine, the sport, the exercising regularly, talking to other people, even doing this interview, enables you to get a little bit of help. It is just that one little word that I might say in that interview that could help someone else out there," he said.
Harry and Meghan will also visit Fiji, Tonga and New Zealand during their 16-day tour.
APTN / Newshub.
