I've read to my kids since they were small, generally fiction books. To mix things up I recently read them Ticket to Hell Via Dieppe by Robert Prouse (with a little selective editing). It was a huge hit so we went on to read a biography by a member of the 507th 82nd airborne, and now we are reading Ernie's War The Best of Ernie Pyle's World War 2 Dispatches. Mr. Pyle does a good job of portraying in a very human way what the infantry experience at the squad and foxhole level. Even my wife has started listening and occasionally commenting and sometimes I can't read for the kids interrupting with questions. Occasionally, we read about certain characters in his book and our able to pull them up the internet based on the fact that they have been made famous by being mentioned in his column.
I would be curious to hear of WW2 related books that the rest of you have read that would appeal to kids.