Private R. Gaudry of the 2-3d Battalion, AIF (Australian Imperial Force) with his Owen submachine gun in  New Guinea; South-Western Pacific, 1945.
The Owen sub was the only entirely Australian-designed and constructed service submachine gun of World War II and was used by the Australian Army from 1942 until 1971.

Fighter with his own country's weapon

Balikpapan, a major oil producing and port city, Netherland, East Indies.  
A platoon of Australian infantry from 7th Division move forward to clear the suburb of Klandasan of any remaining Japanese; July 1945.  

Borneo Campaign. Battle of Balikpapan

Australian soldiers on the Kokoda Track (or Trail) in New Guinea, South-Western Pacific Ocean; c. 1942-43. 
The soldier in the foreground carries an American Thompson submachine gun.