The Benchmade AFO (Armed Forces Only) II is one tough knife. Contrary to what the name implies anyone can own this knife. It is an automatic knife, so there are some who may not be able to own one. I have had it for several years, and it has been my go to carry knife for most of that time. The action is fast and secure. When it opens, you know it is opened. It holds an edge extremely well no matter what you are cutting. I have sharpened mine exactly three times since I have owned it, and it will still shave your arm or cut that piece of paper as if it were brand new.
The price for this knife (as with all Benchmade Knives) is high, but if you need a durable, tough knife give Benchmade a look.