After training at 1st Australian Commando Training Battalion, Arthur joined the unit at Canungra, Qld as a Trooper on 15 May 1943, but before the unit left for New Guinea, he fell ill and was transferred to hospital on 20 May 1943 and was discharged from hospital on 6 Jun 1943. He then spent some time recuperating and embarked aboard "KATOOMBA" for New Guinea, disembarking at LAE on 19 Feb 1944 and re-joined the unit on 29 Mar 1944. Arthur transferred to 2/3rd Australia Composite Anti Aircraft Regiment on 24 Apr 1944.
He embarked from LAE aboard "ORMISTON" for TOWNSVILLE on 27 Apr 1944.
Arthur embarked from aboard "SEA RAY" on 10 Apr 1945 and disembarked at MOROTAI on 22 Apr 1945, he then embarked aboard LST 697 for LUBUAN, British North Borneo on 2 Jun 1945.
He returned to Australia on 20 Dec 1945 and was discharged on 8 Jan 1946.