PHOTO: Members of Z Special Unit at their base at East Arm, near Darwin. (Australian War Memorial P03924.002)
Dr Connor said one of the most famous examples was an operation involving a ship called the Krait, where soldiers had to go behind Japanese lines by boat.
"It was an old battered wooden ship, so no-one would suspect this ship as it was sailing in towards Singapore."
Australian Z Special Unit commando operatives on board the MV Krait during World War II.
Group portrait of British and Australian Army, Royal Navy and Royal Australian Navy members of Z Special Unit on Morotai in September 1945.
Mervyn Fox, who served in WWII with the elite commando squad Z Special Unit, paid a visit to the unit's East Arm base.
God bless these brave men and God hold dear the ones who never came home.
Twenty-three former Z unit members from Australia will attend the ceremony on August 1, as well as 18 widows.
But the Z Special Unit also had recruits from New Zealand, and eight families are travelling from there.
Dr Helliwell said she was still searching for more.