Great that you have more than one family member interested in preserving history. I would encourage you do document as much of the history of the items as you can (Great Uncles name unit etc) and keep it with each item. It may not contribute much to the value but perhaps down the road it will be priceless to the next generation of your family. I have a WWI scrapbook that was my Grandfathers without a single caption on a single photo. The names etc.. lost forever.