The two things in creative writing that make my eyes glaze over is sloppy research on hardware and Mary Sue super soldiers. I can't do anything about the black-ops themes, but I can steer you in the right direction on knives. Now, I'd love to show you some pictures of the knife, but I did that once and the mods mistook the picture I posted as "spam." I'll tell you what it is, and why it would make a realistic knife for your story. If you go to the coffee bar in your area, peruse the latest issue of American Handgunner. Due to the logo, it sometimes just looks like 'Handgunner.' I have long been a fan of ESEE knives. For a soldier, a cop, or a merc they are darned near the perfect edge. This company is an offshoot of a former business that really did make equipment for super soldiers, and now offers the knives to us folks. While their Number 3 is the big seller in my area, the article states that the Number 5 is the one most chosen by professionals. It's made from rather mundane no-chromium carbon steel called 1095. The idea for pros is that it bends but won't break, stays relatively sharp with use and can be re-sharpened on a wet rock from a river. These knives do get insanely sharp. You won't have to create bragging rights for their products. I did just get an ESEE Candiru, and it's made from the same 1095 alloy. It got sharper than a straight razor on the first polish. Picture below. If your story needs a knife, use a good one.