David Hicks was the first Guantanamo prisoner to be convicted of war crimes, pleading guilty in March 2007 to providing material support for terrorism. The deal got him out of the US base in Cuba, with most of his seven-year sentence suspended, and he was freed by the end of that year.
His lawyers have now filed an appeal on his behalf, arguing that a ruling in another Guantanamo case that struck down the charge of providing material support for terrorism should now be applied to Hicks. They say his plea deal was an involuntary act of desperation after more than five years in custody.
Hicks told reporters in Australia today that the appeal is intended to help him get on with his life.
"It is important, for myself and for my family and those who have supported me and had faith in me over the years," he said. "It will help with closure and moving forward."
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The court ruled that material support for terrorism did not meet the criteria of a war crime that could be prosecuted by the military commission under the 2006 legislation that set up the special tribunal at Guantanamo.
In addition to vacating Hamdan's conviction, the ruling has cast doubt on at least three other military commission convictions and has limited the overall number of Guantanamo prisoners who can be prosecuted.
A Pentagon spokesman, Lt. Col. Todd Breasseale, said a crucial difference between the Hamdan and Hicks cases is that the Australian pleaded guilty.
"As part of that agreement he waived any appellate review of his conviction in exchange for a reduced sentence that he could serve in Australia and today he is free," Breasseale said.