Australia's largest city is gearing up for the start of the Invictus Games.
The sport-mad nation has been involved in the event since its creation by Prince Harry back in 2014.
But this is will be Australia's first home games, which will see teams participating in 13 sports, across eight days of competition.
Retired Lieutenant General Peter Leahy, Chairman of the International Australian Military Games, says the Invictus Games helps the athletes "on their journey to recovery".
"They've been restricted in what they can do but they're overcoming those restrictions," he said.
"They're presenting the best part of themselves by indulging in competition."
To mark the occasion Prince Harry and the Australian Prime Minister, Scott Morrison MP, climbed the Sydney Harbour Bridge to officially raise the Invictus Games flag.
A tour of the host city, with the 2018 mascot
The Australian team's co-captain, Nicole Bradley, says the competition has helped to increase awareness of the issues that wounded, injured and sick veterans face.
"The biggest thing that we've really noticed is that all of our team at some point have had their mental condition changed by service."
The competition will be taking place across the city.
Sailing and cycling events will be staged near the Sydney Opera House, which is also serving as the backdrop for the opening ceremony on Saturday night.
But most of the action will at the Olympic Park in the west of Sydney.
The venue hosted the 2000 Olympic Games, where UK athletes like Jonathan Edwards and Denise Lewis both won gold medals.
All 18 Invictus Games teams will be staying at the Olympic Park.
The competition in the pool begins next Tuesday and the track and field events start on Thursday.
Keep up to date with the 2018 Invictus Games here.