The Combat Knife is one of the bonus weapons in the Resident Evil 2 remake.
"A specially-treated military-grade knife that's been hardened to an unbelievable degree. They say it's been made to really last."
This knife behaves the same way as its default version, but it will never break. Of note, the only way players can "lose" this weapon is if they use it as a defense item and don't retrive it afterwards.
Unlike other bonus weapons carrying an infinite feature attached to them, using this iteration of combat knife won't penalize players from achieving an S+ rank. That said, it is highly reccomended that aspiring players who aim for achieving S+ rank on Hardcore mode to hunt down all 15 Mr. Raccoons to unlock this first. However, as of February 11, 2019, using this knife will nullify the play data for the RE.NET Weekly Challenges unless specified otherwise.
This knife is also featured in the model viewer, in order to unlock it, the player needs to obtain all of the weapons in Claire's story.
While it remains a relatively weak and dangerous weapon to use like its normal counterpart, its unbreakable nature makes finishing downed zombies a breeze ergo saving ammo a far more easy feat to achieve.