Thanks Sam
I've watched a lot of documentaries on WW2, particularly in the Pacific, and especially around New Britain. The Rabaul garrison was a core of their Australian invasion army. Dad said they had huge amounts of tanks, trucks, and artillery stored in caves to preserve them from Allied air strikes. However, the Allies did extensively bomb the Rabaul airfield, warehourses, barracks, port, and ships. After the Japanese navy became ineffective, it was too late for the garrison to be evacuated or even resupplied. So a scenario might have been an officer's barracks gets bombed whist he was hiding in a nearby cave or bomb shelter. Afterwards he finds his sword destroyed. There is no chance to get another "proper" suitable sword as a replacement, so he grabs the best he can find, puts on the correct tassles, and continues like everything is OK, even though the men are starving. It takes a lot to feed 100,000 men. He needed to keep up appearances for morale. Then 6 to 12 months later the war was over. Dad didn't take the sword. He said the Colonel happily gave it to him, happy that he'd survived the war. And that sword meant nothing to the Colonel as it was a "nothing" sword and he'd only had it for 6 to 12 months. It wasn't a family heirloom or valuable. That is a possible scenario but we will never know.
But thanks again for giving me the information about the sword. It's a link to my long dead, very much loved father.
John