US document shows reported abuse of POWs:
Hicks's father Terry Hicks said last year the Australian "suffered beatings and anal penetration".
In 2004, Prime Minister John Howard cast doubt on the claims.
"I find it strange that these allegations of abuse against Mr Hicks ... have arisen only since the prisoner abuse scandal erupted," Mr Howard said at the time.
Terry Hicks says the officer's report proves US officials were sexually abusing prisoners of war.
"If it was the doctor doing it then that's part of the process these prisoners go through ... but this was a thug."
Mr Hicks said he held out little hope of a reopening of any investigation into the alleged abuse.