Well I was going to suggest a US medical corpsman knife. But when I went lookin' for a pic on the net. I see they run from 185 to 300 bucks. Yikes I have my dad's one of the few things I have left from him!
they are real heavy duty and quite thick bladed.
My pics are on photobucket just didn't want to go and upload em I'm on dial-up takes forever.
So here are a few I found on the net sad but I guess they are a collectors item now.