Trench Knife

A  is a combat knife designed to kill or gravely incapacitate an enemy soldier at close quarters, as might be encountered in a trenchline or other confined area. It was developed in response to a need for a close combat weapon for soldiers conducting assaults and raids on enemy trenchlines during the First World War.

Call of Duty: WWII
The weapon was either cut from the game or could be released via microtransactions in the future.