Harris was an original member of the unit, embarking aboard “S.S. ZEALANDIA” on 8 Dec 1941 for Timor as a Private in No 2 Sect, “A” Platoon. After the campaign on Timor, he embarked with the unit, for Australia aboard the Royal Dutch destroyer “Tjerk Hiddes” on either 11 Dec 1942 or 16 Dec 1942, as the embarkation rolls do not differentiate.
After leave and reorganization he embarked with the unit for New Guinea aboard S.S. “DUNTROON” on 17 Jun 1943 as a Lance Corporal.
He transferred out of the unit to 4th Reinforcement Training Battalion on 10 Oct 1943 and was discharged 31 Aug 1945.
Harris re-joined the Australian Army for the Korean War with Service No 5995 and served with the 3rd Battalion, The Royal Australian Regiment in Korea, 21 Nov 1951 to 29 Oct 1952.