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A combat knife is a multipurpose knife used by the United Nations Space Command. All UNSC troops are issued a combat knife for utility uses as well as a backup weapon for desperate close combat situations.
The combat knife has a blade 20 centimetres (7.9 in) long made of high carbon steel, an anti-flash non-reflective titanium carbide coating, and an edge-coat for corrosion and rust resistance. It is 43.3 centimetres (1 ft 5.0 in) when sheathed. The weapon is also weighted for throwing.
- A larger version of the combat knife, the machete, was intended to be used in Pre-Xbox Halo.
- This is a signature weapon of assassinations.
- Emile-A239 uses a Kukri for a knife.