sentences:  He returned to Australia in 1979 to finish his schooling at Tweed Valley College in Murwillumbah, where he was awarded Dux in 1988.Greive joined the Australian Army after leaving high school and underwent training at the Royal Military College Duntroon in Canberra.Whilst an undergraduate at RMC Duntroon, Greive undertook a military exchange with the Royal Thai Military Academy, during which he toured Thai/Cambodian border military installations and refugee camps.