The traditions of Remembrance Day must be passed down through schools to ensure students understand the sacrifice of Australian servicemen and women, a guest at the Adelaide service says.
People across South Australia stopped for a minute's silence to mark Remembrance Day on Monday.
In Adelaide, Richard Muhm, a member of the Freemasons fraternal organisation, said several of his family members had been involved in conflicts.
He said Monday's service was conducted "with extreme decorum, respect and dignity", but a concerted effort was needed to ensure the tradition continues.
"We've got to put in the groundwork," he said.
"Get it out into the schools, colleges. Remind the young ones of exactly what went down and how horrific it was."
Mr Muhm was joined by 22-year-old Cooper Allan, also a Freemason, who agreed young people must be made aware of Australia's wartime history.
"I've decided to come because wars are part of the fabric of Australian society in every facet," he said.
"Certainly we must remember the sacrifice that was given, and in remembering, we should hope to never do anything like this again. It was an awful thing, the war."
Governor Hieu Van Le and Premier Steven Marshall laid wreaths during the service, held at the National War Memorial on North Terrace.
Thousands of crosses were planted in the lawns next to Government House while four air force FA-18 Hornet fighters conducted flyovers of the city.
Nearby, a silent group of about 15 held banners and posters as part of a peaceful protest supporting a campaign for a royal commission into military suicides.
On the other side of the city, at the Australian Imperial Forces section of Adelaide's West Terrace Cemetery, more than 200 school students honoured South Australian war heroes at a special service.
A red poppy was placed at each gravesite ahead of the event, which concluded with a lone bugler playing the last post.