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I'll have a shot at a Blackhawk.
With ring bolts like that, I'm assuming they would be used to tie an airframe down to the deck of a carrier and again, I'm only guessing a chopper 'cos of the colour.
My first thought was a it belongs to a B25....Doolitle raid type of scenario.
Hmm, Avro Lancaster?Four engines....sometimes five !
It seems clear, and that wind screen frame makes me think it might be used for evacuation of some liquid of sort...Thats not a a camera port in the picture...