Why the invasion of Rabaul has been left out of our national story

There will be a radio documentary, which can be listened to and downloaded, broadcast at 1pm (each state) on Earshot tomorrow November 11 2017, on ABC Radio National.

Today on ABC online (10 November 2017), an article about the invasion of Rabaul in 1942 was featured in a lead up to the radio documentary tomorrow.
The article is at:
http://www.abc.net.au/news/2017-11-10/how-did-australia-forget-wwii-catastrophe-in-rabaul/9106728 

While Kokoda continues to loom large in the minds of Australians, Rabaul hardly resonates. Why has this national disaster never been part of the nation’s story?