To me, we are seeing two objects out of context. Maybe a swagger stick and the katana. Show the entire saya if it is only representing the katana. The wiki notes a Japanese honor but not his regiment. If the presentation is indeed on the saya, there would be a paper trail somewhere regarding the presentation added to an older sword (the sword predating his service years).
His autobiography Khaki and Gown (1941) was followed by In my time: recollections and anecdotes (1946)
Indeed, always display the entire object when asking regarding a knife or sword. Indeed any object.
Cheers
GC