I found this picture on the State Library of Victoria website. I believe it was first published in The Argus newspaper (page 1) on Tuesday, 3 July 1945.
“Driver R. T. Wilson, of Victoria, took his ukulele with him for the 7th Division landing at Balikpapen. This picture was taken at a Netherlands Indies staging point. (Australian Official photo.)”
This is the second driver (see War and the Ukulele) that I’ve found who played ukulele. This particular ukulele appears to be of Hawaiian construction, and I like to think it is a Kumalae uke (but I don’t really know).
Balikpapen, Indonessia is a seaport city on the eastern coast of Borneo island, Indonesia in the East Kalimantan province. coordinates 1°15′S 116°50′E (from Wikipedia)
Photo used with permission of the State Library of Victoria.