Even before touching Iraqi soil, about 300 Australian soldiers heading overseas are on the lookout for attacks from the enemy.
The personnel, drawn largely from the Australian Army's Brisbane-based 7th Brigade, were farewelled by family and political leaders at Gallipoli Barracks on Tuesday.
Taskgroup Taji Commander Colonel Matthew Galton requested media not identify soldiers being deployed to help train the Iraqi army, or their families, because of fears they could be targeted online by Islamic State.
"The enemy we're facing over there has shown themselves to be quite sophisticated with being able to exploit things like social media," Col Galton said.
"So we're just taking prudent precautions just for the safety of the troops, and more so for the safety of their families here as well."
One soldier said although it was his first deployment, there was a mood among the troops that their mission would hopefully have a worldwide benefit.
"The tentacles of ISIS reach far and wide now," he told AAP.
"If we can get over there and help the Iraqis, then it has a follow-on effect for the rest of the world."
His partner, like many others present to farewell their loved ones, said she didn't want to think about the next six months away from him.
Prime Minister Tony Abbott vowed loved ones would be looked after while the troops were in the Middle East.
"We will support them on your behalf as you support us, for they also serve who only stand and wait," he said.
Many of those who spoke - including Opposition Leader Bill Shorten, Defence Minister Kevin Andrews and defence head Air Chief Marshal Mark Binskin - acknowledged the timing of the deployment on the eve of the Anzac centenary commemorations.
Taskgroup Taji will work with about 100 New Zealand defence personnel to train local forces.
Mr Andrews described them as "modern Anzacs".
"You are the successors of that great Australian and New Zealand legacy," he said.
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