Marking 111 years since Australian troops landed in Gallipoli, tens of thousands turned out to commemorate Anzac Day nationwide on Saturday.
But the sombre occasion was blighted by a small but disruptive and vocal minority, who heckled and booed during traditional Indigenous acknowledgements at the start of dawn services.
Official events in Sydney and Melbourne were disrupted, prompting condemnation by politicians and RSL leaders for the lack of respect shown.
Opposition Leader Angus Taylor said the booing was inappropriate and should not have happened, but he understood people's frustrations about the "overuse" of acknowledgement of Country ceremonies.
"I would like to see them used less and therefore not devalued as I think they have been over time," he told ABC's Insiders program on Sunday.
Five people reportedly linked to the anti-immigration March for Australia group were ejected from the Anzac Day dawn service in Perth.
WA Police said they issued several move-on orders to the cohort, who were identified as members of issue-motivated groups.
"Due to your association with the March for Australia group and their actions in the eastern states, you're being removed from the ceremony due to the belief that you will interrupt it," a police officer was recorded telling the group in footage shared on social media.
"Your association to that group has unfortunately ruined your opportunity to remain at the ceremony."
March for Australia has been behind a series of anti-immigration rallies nationwide, some of which have also featured neo-Nazi speakers and attendees.
Fifteen move-on orders were issued across the state, with 14 in the metropolitan area and one in regional WA. No arrests were made.
NSW Police arrested and charged a 24-year-old man in Sydney with committing nuisance, and he will appear in court on June 3.
Several other people among the 11,000-strong Sydney crowd were moved on.
The fact that some Australians booed elders, including those who had fought for the nation, was disrespectful to Indigenous servicemen and women and to other Anzacs, Aboriginal and Torres Strait Islander social justice commissioner Katie Kiss said.
"Australians are starting to stand up to that and we saw that yesterday in the thousands of people who stood with our elders during what was a disgraceful display of vilification," she told ABC News.
It was up to Traditional Owners and event organisers to determine if an acknowledgement of Country was appropriate, she said.
Almost 2000 people attended the dawn service at Anzac Cove on the shores of Gallipoli in Turkey on Saturday.
More than 8000 Australian soldiers died in the failed effort to wrest control of the Dardanelles in 1915.
But the battle is credited with helping to galvanise the nation's national identity.
Across major cities in Australia, tens of thousands of people lined the streets to honour veterans and their families at annual Anzac Day marches.
Among those marking the date was Ben Roberts-Smith, Australia's most decorated living soldier and now an accused war criminal.
The 47-year-old Victoria Cross recipient attended a ceremony on the Gold Coast just over a week after being released on bail following the laying of multiple war crime-related murder charges against him.
"I've never thought about not coming. I was always going to be here," the veteran, who denies the allegations, said.
With formalities concluded, many people migrated to hotels to indulge in another Anzac Day tradition: two-up.
The gambling game can only legally be held on Anzac Day after midday.
