However the likelihood of John Rambo owning a Gerber Mk II in real life would’ve been highly plausible. In fact this knife has such a history and checkered past that one would ask, why didn’t Rambo use it? So with that being said let’s dive into this knife that was designed like it’s predecessor the Fairbairn-Sykes Fighting Knife to be downright deadly. The Gerber Mark II (commonly called the Mark II) was designed by retired U.S. Army Captain Clarence A. The Mk II saw design changes over the course of its production (with a small 2002 limited run).