If he has them, get him a nice photo album and sit down with him and go through his photos. From when he was a kid to his later years. Focus on who he is as a person and work in the WWII stories so you find out about the man he is today. Not just the man he was for 4-5 years. He will have a lifetime of stories to tell you. I wish I had relatives still alive from WWII. Good luck, it should be interesting.