Combat knife
Overview
A combat knife is a fighting knife
Fighting knife
A fighting knife is a knife with a blade designed to inflict a lethal injury in a physical confrontation between two or more individuals at very short range...

designed solely for military use and primarily intended for hand-to-hand or close combat
Close combat
*Close combat is a generic term for both Close Quarters Battle and Hand to hand combat.*Mêlée generally refers to disorganized close combat.*CQB is an acronym for Close Quarters Battle, such as that which occurs in urban warfare....

 fighting.

Since the end of trench warfare
Trench warfare
Trench warfare is a form of occupied fighting lines, consisting largely of trenches, in which troops are largely immune to the enemy's small arms fire and are substantially sheltered from artillery...

, most military combat knives have been secondarily designed for utility use (clearing foliage, chopping branches for cover, opening ammunition crates, etc.) in addition to their original role as close-quarter combat weapons, and may be referred to as fighting-utility knives.
 
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