[Flashpoint]

I recall a guy I was tree planting with in college. He told me about his grandfather who never talked about WWII until he went senile. Then all these stories started coming out. The most horrific things imaginable. Even keeping in mind the context (WWII where people are trying to kill you on a daily basis) his grandfather would be talking about taking a German officer and nailing him to a church door and cutting off body parts to get him to talk about which road the other Germans had taken out of town.

My point is that there may be a very good reason your Grandfather chose not to talk about the horrors of war.

I'm not saying don't do it. History is very important. Just be prepared for the possibility you might learn something you won't be proud of. War is horrific on both sides, and medals and battle orders don't tell the "on the ground" story of men killing and being killed.