For day to day covert backup weapons, folding tactical knives fit nicely into the continuum of force: compact, relatively fast, deadly with training, and easy to conceal. However if engaged in OVERT combat operations (and you have forewarning of conflict), like in the military, our options open up a lot. Maybe then we would prefer the longer reach, speed, and versatility of a fixed tactical blade… if you can take the added weight and bulk. Here’s two fixed blade tacticals I think real highly of.