Just because the military (any military) issue something, it doesn't mean it's any good.
two words.
Lowest. Bidder.
The lowest bidder argument doesn't always hold from the design perspective -- it's true for manufacturing, but not design.
The Kabar Marine knife has been made by other manufacturers for the Marines over the years, however the design hasn't changed much.
And that design is not precisely for woodcraft -- it's more of a general use war knife. And that category has complicated demands: it might be userd to dig and as a hammer and to cut brush and as a spear and can be used to cut metal sheeting (batoned), pry things, cut wire and, yes to cut and kill etc, etc, etc. It's a general purpose tool for people who are doing one of the most complicated and unpredictable jobs in the world: military service.
The design has been optimized over decades and that design nothing to do with lowest bidder.
The Kabar is a warrior's field knife and frankly it is nearly perfect in that role -- only the kukri and the Kizlyar DV2 come close in my mind. Of the three, I think the kukri is *far* superior in this category because it has even more general purpose uses. But be that as it may a Kabar is nearly perfect as a warrior's knife.
I would not, however, dream of using it as bushcraft knife. If I needed a big blade to go with my puukko, it would be my leuku or kukri because I can do so much more with them (use as a drawknife, etc.) Nor can I imagine dressing game with a Kabar.
But I think it's a mistake to understate the mystique, the tradition and the sheer capability of the Kabar Marine knife. It is a significant part of history. On both sides of the Atlantic we owe a lot to that knife and the people who carried it.
So if you want to get one, by all means do so. Anyone interested in sharp things should have a Kabar around somewhere. You'll have Big History on your belt. But don't be surprised if, after taking it afield a couple of times, you wind up taking a Mora with you instead.
Sorry for going on so long! I just feel the Kabar deserves love, even if I wouldn't take it into the field.
Oh and if you want a knife like the Mountain Men carried, consider an Old Hickory Butcher knife -- it costs about $9US and is very close to the Hudson Bay knife in overall dimensions. Or you can get a newly forged Hudson Bay Knife from www.mlknives.com!