Those inflatable rubber "boats" look a lot like the pontoons used during the war to temporarily bridge rivers. Wikipedia has a good article on pontoon bridges...
https://en.wikipedia.org/wiki/Pontoon_bridge
I copied a couple of pictures from that article to show the resemblence to the rubber "boats"
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Regards, Marv
Smart phones are to people what laser pointers are to cats
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baja (Feb 9, 2021), Jon (Feb 7, 2021), Toolmaker51 (Feb 7, 2021), volodar (Feb 9, 2021)
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