My boot knife is a Fairbairn-Sykes, left over from my military days. That’s for quiet work. No, didn’t do any of that overseas…but I did get an anatomy class *evil grin*
For down and dirty HTH, a surplus East German shovel with sharp edges. Heavy, handy, and deadly in close work. I keep that in my 4X4, plus 2 machetes, and an axe. I pray I never get an opportunity to use them that way….