look like someone proposed A combat Helicopter base on his experience during Vietnam war
or someone made humorous proposal for US version of Mil Mi-24...
I expect we are looking at a simple view of what some junior officer thought were the correct requirements for an attack/assault helicopter in the mid-1960's. Likely part of a study or article for publication.
Do you maybe have some additional bits of info? Because going through each individual page is not only tedious but also outright Impossible for technical reasons. However this may be the best bet. Because reverse image search didn't bring any results whatsoever.
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