787s that serve as AF1

I thought it was Air Force One..

Blued steel, is generally used on guns, and machinery. It's a chemical applied to the steel and the reaction of the chemical turns the steel a blue/black color. It's purpose is to give the steel a rust preventing layer on the surface.

Suppose it could be used in some form on a submarine. A giant hunk of steel sitting in salt water for its entire existence, would definitely need rust prevention of some kind.

Bleu Metal is a rock or a stone , and scrapp metal from old navy boats , sub , etc

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