Tactical Knife

The  is a weapon attachment in Call of Duty: Modern Warfare 2 for handguns. It makes the character hold both a pistol and a knife at the same time, letting the player stab about twice as fast.

Trivia
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 * An immensely popular class is using Marathon, Lightweight, and Commando with the Tactical Knife to create an unworldly fast knifer.
 * In real life, a tactical knife is a knife designed and recommended for military uses which include clearing foliage, cutting branches, or opening locks and containers - not killing.
 * The technique used with the tactical knife bears a striking resemblance to that of the Harries technique to hold a tactical flashlight.
 * There is no animation for the Tactical Knife from another player's perspective; all they will see is the player (who is using the Tactical Knife) holding the handgun normally, and performing a standard knife attack when stabbing.
 * In early demonstration videos, such as the Cliffhanger video, the knife user slashed with it. In the final version, the user stabs with the knife. This is likely because stabbing is a quicker motion than slashing.
 * In single player, the USP .45 comes with the tactical knife attachment every time.