Brian,
Very nice story!
As you got some additional information about your granddad, if I were you, I would go further and honor his service by doing a shadow box showing his medals (repositions are plenty and for nice prices) and any other memorabilia from his military service that you may be able to recover (dog tags, etc.). In addition I would include this nice picture of him holding his war booty.
Using the information you posted, we can reconstruct as below.
There are some great examples of shadow boxes on e-bay:
http://www.ebay.com/sch/Militaria-/1...w=shadow+boxes (no afiliation)
Your sons would be greatful.
All the best,
Douglas