Many of the NVA Para´s never ever saw the KM66 at first hand, nor they knew, such combat knives are existing actually ...
But, the KM66 was an element of the training of the NVA Para´s, "Lurp´s", and, Army diver´s, more or less, partially.
Here´s images of an widely used one, (3rd pattern), I received only a few day´s ago:
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