A Gerber Guardian was a type of double-edged knife used for combat. Nina Myers had a Gerber Guardian II in her garter during Trojan Horse, and used it to cut away Abigail Heyer's dress to expose her hidden explosives. (Trojan Horse) During Collateral Damage, Jack Bauer found 2 Gerber Guardian knives among other weapons in Erno Tobias's wardrobe. He stashed the knives, along with an M9 bayonet, in his Hawk's utility vest. (Collateral Damage)