I can't see a role for the US knife in your average survival situation.
The aircrew knife is essentially intended to cut straps and lines and nothing more. The old knife with the bent blade carried until I know not when was hopeless. Perpetually blunt and resisted all efforts to sharpen it. Despite this I know of least one downed bod who managed to slice his dinghy canopy with it as he tried to sever rigging lines which were entangling him. I shudder to think of the carnage he would've caused with a really sharp pointy thing!
Stick with a well designed J knife. In the dark in the oggin it would be much, much easier to use than a single edged knife.