Ahhh - good old 'Grauniad', 'Marshall' was the name given to the individual aircraft which was actually a Martin Mars - not mentioned in the article. Until very recently, a couple of these gigantic 'planes were used for water-bombing forest fires ; they're now 'grounded' on a lake in Canada.

You can see lots more at ; -

http://www.vectorsite.net/avmars.html

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"Stand by to pull me out of the seat if I get hit" - Guy Gibson