The Australian Greens today join the community in honouring the service of the men and women who served in Afghanistan as part of Operation Slipper and welcome them home.

"Around Australia today people have come together to say thank you to all those who put their lives on the line in Afghanistan, and to honour their service, and I join them," said Greens Leader Christine Milne.

Reports that Prime Minister Tony Abbott sought to unilaterally engage 3,500 Australian troops in a ground offensive in Iraq are a frightening insight into a leader whose solution to everything is more aggression. We urgently need to give the whole of parliament the final say on going to war, says Greens Leader Christine Milne.

"No one in their right mind would suggest something as reckless as Australia launching a unilateral ground invasion of Iraq, but reports suggest that our Prime Minister did just that," Greens Leader Christine Milne said.

Australian Greens Leader Christine Milne says Tony Abbott has sent Australians to another war in Iraq with a claim that following the United States is in our national interest.

"The Greens stand with those Australians who are asking why is it in Australia's national interest to join in a another war in the Middle East without a clear strategic objective or risk assessment?" Senator Milne said.

"How will this war make us safer? Won't it make us a bigger terrorism target and a more attractive recruiting ground for jihadists?

Greens Leader Christine Milne has called on Australians to stand together against terrorism threats on home soil, saying unity, not war, will deliver lasting peace.

"The best way to keep Australians safe is to bring them together, not blindly follow the US into an unwinnable war in the Middle East," said Senator Milne.

"Are we going to another war in the Middle East because the terror alert has been raised, or the other way around?

Australian Greens Leader Christine Milne says Tony Abbott should level with the men and women of Australia's Defence Force when he farewells them tomorrow on an open-ended mission to Iraq.

"When you ask young men and women to put their lives on the line, you should be honest enough to tell them that you're committing them to war," said Senator Milne.

"This has been mission creep from the start. Australia is getting itself into an open-ended war.