... there is no 'military' application of a knife. There are a lot of different knives that have been issued or carried NSNs, and they had nothing in common except for an edge and a handle.
Every single object ever created is tactical by a definition of having an intended purpose.
Not quite the sense of the definition. Every
tool is "tactical" in that sense, but the term is most often used in reference to military operations (throughout history, I might add - is simply anglicized Greek word), hence that incorporation. Looking at military issue knives from history, many have a
great deal in common to the point of being difficult to distinguish between, the most recognizable being the KaBar.
The fact that so many knives are now marketed as "tactical", even with a certain level of serious sincerity (e.g. Gerber, Fox, Benchmade, Leatherman, etc.), indeed testifies to the great variation one might employ in designing a knife for military personnel, much more so anyone else. Why is it that so many military knives of the last few centuries look so similar? Why do chef's knives appear by-and-large identical to most observers?
But there are specific design features catering toward intended uses, including blade length, profile, steel hardness ... really every feature can be designed to improve end-user function.
"Tactical" features:
Dark blade = less noticable
pocket-clip = simple carry, readily accessible, easily concealed
Thumb-stud/hole/disk = single-hand operation folder
locking-blade = increased strength & reliability in a folder against myriad force vectors
thick stock = increased lateral strength (prying)
Serrations = increased cutting performance on fibrous and flexible/resilient material
multiple grind angles = varied levels of durability and cutting performance on a single blade
contoured handle = ease of indexing
abrasive handle = increased retention
steel liners = increased strength
stainless steel = reduced maintenance
But I'd like to ask what the point is, in fixed blades, of
full-width full length full-stock tangs... They add weight without significant needed strength, they reduce comfort through conduction of heat/cold/electricity/impact... I guess it is just cheaper to do it that way...