Its an area of research I've been meaning to get stuck into - which is a shame as I've neglected it given I'm 10 minutes from the national archives and national library here. I'll go back and read my copy of the Battle of Brisbane which from memory talks about similar issues.
The Australians could be as racist as all hell. However they were often rather particular who they were racist to. American blacks were often considered "allright" whereas indigenous Australians were considered the lowest of the low. I often thought that remarkable. What was even more interesting was once the Armed Services overcame their colour bar, the Indigenous Australians who were recruited found they were treated exactly as well as the White soldiers. Kath Noonuccal Walker often remarked on how well she was treated in her military career. It was quite an eye opener for both the Indigenous Australians and the White soldiers. My old WO who had served in Korea had served under "Reg" Saunders, the first Indigenous Australian to be commissioned. He wouldn't hear a bad word said about Indigenous Australians. Today, we have NORFORCE which has about 75% Indigenous soldiers amongst it's numbers. They regularly patrol the Top End. They are a valuable resource which we ignored for too long.