[Popsquatch]

Good to see that you've kept it original. My granddad was out there too for the last year of the war on a minesweeper (USS Swift AM-122) and got back in 46 after they stayed past the surrender to sweep mines in the area. He had an Arisaka and either a bayonet or an officer's short sword hanging up on the wall, as well as an 03. I seldom got to actually handle either as a kid, and they were apparently taken or gifted after he passed. No clue where they ended up.
The bolt handle on yours looks like a "last-ditch" late war issue. Does it have a steel or wooden buttplate? Last-ditch are a little less common if I remember right. Polishing the internals makes for a much better shooting experience if so. And a recoil pad. They pack a punch. Enjoy.