Bottom Line: If you mostly need to split wood, buy an axe. If you mostly need to skin game, carve wooden tools, build traps, slice veggies for camp dinner etc, buy a smaller, more maneuverable knife. If you need to egress a falling building after an earthquake or other unexpected disaster, carry around a wrecking/pry bar. If you mostly need to fight bad guys and zombies during the apocalypse get yourself a gun...
if you can't carry all of those tools around all the time, but hypothetically need to be able to perform those tasks in a pinch, the Ka-Bar BK2 is a good choice... except for fighting- the weight of the knife would be a huge disadvantage in live combat, unless you are fighting slow moving zombies or a sedated peter griffin from family guy...
That being said, this knife is solid; the feel inspires confidence and feels reliable. The blade angle facilitates a variety of uses, and the blade steel is of working class.
For survival bush craft, this knife is great for shelter-building. Some reviewers in survivalist forums complained that the length of the blade limited one to batoning smaller logs during shelter building...I don't know what kind of shelters they are building that would require one to process logs thicker than 5in. in diameter...if you have the time and energy to build yourself a LOG CABIN in a SURVIVAL situation then you probably also have a chainsaw... and a pet unicorn to cuddle with for moral support once your log cabin is built... for the rest of us who would need to budget our time and energy during such a situation, this knife is a good option.
The BK2 is great because it is good for many things, but it is not great at any ONE thing. ( read that again if you have to )
Its a fantastic buy for those who, for whatever reason, are confined to carrying one relatively small knife, in a get home bag, but are not too concerned about the added weight .