It's a 20-year-old Air Force survival knife made by Ontario Knife Company. I use it to cut, chop, and pry anything that doesn't need either a chainsaw or a wrecking bar. It's heavy and clunky and absolutely dependable. Most of the original black coating has worn off, and it's been resharpened a mess of times, which is getting harder given the increasing thickness of the blade as you go back from the edge. I'm going to have to grind a shallow bevel on it soon, or it's going to resemble an axe blade in cross section. Come to think of it, I sort of use it as I would an axe, so why bother?