The Air & Space museum at Dulles AP has a WWII big bomber engine on display. Can't remember the aircraft it was on. Back when the WWII memorial was officially opened one Memorial Day, I had ridden down to the Rolling Thunder event, then rode back out to the museum. WWII vets were all over DC and the museum. I saw a crowd of people by this bomber engine and got close enough to hear. A vet was there with his daughter. He had been a mechanic for this engine in WWII. He didn't know it was there until he saw it and became really animated. He was telling the crowd all about that engine, it's strengths and weaknesses. He said they leaked oil like crazy but were dependable. I was standing by his daughter and she was dumbfounded. She had never seen him like this and had never known what he did. People were fascinated and the crowd grew and grew. It was the coolest thing.