My heavy duty working blade is a Buck "Nighthawk" with a 7" blade. Black oxidized finish over stainless steel, terrific grip, best ergonomics ever IMHO. Thumb rest top vastly increases stabbing and cutting pressure. Takes a razor edge that is brutally sharp. You can cut wood, gut a deer or fillet a fish with this blade.
It came with a black cordura sheath I didn't like, so I made an epoxy/fiberglass one. Again, just wrap the knife in plastic, then wrap it in fiberglass cloth, and saturate it with epoxy. I made a belt loop out of the same one-piece fiberglass construction since it's a worn outside working blade.
Mine is all black. The part that's shown in green here is a softer grippy rubber.
Their is a riggers coating used by one sheath maker that is like the rubber liquid tool grip gunk that comes in a can. I can't remember the web site but I'll find and post. My civilian kydex IWB sheath has this feature with the rubber O-ring found on most commercial dive knives. The same hole pattern is there for the 550 cord security that I so favored for my randall 14 when not in work mode.
I always prefered a HK P9 in 45ACP that I got from one of your troops that had an Ops Inc can made for it. I felt it was better than any knife in a knife fight .....luckly never had the need to find out about the knife fighting with the P9.
Stay safe !