Thanks for the help Phylo. The Gun/Howitzers were an emergency loan to the US forces on New Caledonia a few months after Pearl Harbor. The US task-force which was to defend New Caledonia in the event of a Japanese attack, was quickly loaded and rushed there, with little attention to proper loading or record-keeping. It was feared that the TF had sailed w/o their organic artillery. Thus the Aussies loaned US forces Australian guns of various calibers. As it turned out, the US Arty arrived later on a different ship; the Aussie guns were kept and formed into extra batteries within US Arty battalions.
John W. Howard