My 9 year old is currently obsessed with tanks, ships, aeroplanes, submarines etc from WW2. I don't like him just searching on Youtube so we are looking for documentaries or films that are good and free and a 12 rating or less. He has seen Memphis Belle and Battle of Britain. He's watched some Time Team where they dig up crashed planes and the Channel 4 documentaries about a man rebuilding a tank. He is really interested in the technology without really grasping the awfulness of it and I'd like him to stay that way for the moment.
Anyone got any suggestions for anything else suitable?