I understand where Inchessi is coming from - he has strong family traditions of which he is very proud, and he wants those traditions to continue. I understand his desire to keep original military documents in the hands of persons with military experience and (hopefully) respect for those sorts of things.

However, I also understand his nephew. The military isn't for everyone (me included) - my grandfather was a military man and served in WWII and Korea, but I know military service would be absolute misery for me. I am hugely interested in my family history, and I am the only one in my family that has any interest in the stories behind the people in the family tree. If I had expressed interest in learning more about a branch of my family tree but was denied that because of a conflict of personality (either with the person holding the records, military service, or both), I would probably drop it and focus all of my attention on another branch in a very un-military fashion. It seems to me this is what Inchessi's nephew did; rather than be confrontational, he decided to explore and embrace an avenue with less resistance.

As far as I can see it, there are two equally valid options:

Hang onto the records to show how very much you want family tradition to be upheld (and I wouldn't blame you at all).
OR
Provide copies of the records in question to your nephew and hope that he'll come to embrace some of the traditions of your side of the family.

I would be a bit concerned that some generation in the future won't have anybody in the service and that those very important documents will be lost, so I would at least give copies out to those you trust to treat them with respect.

Good luck with everything!